What Could Cause The Check Engine Light To Come On

Water can drip down that seam onto the engine valve cover. The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. 25 Most Common Reasons for a Check Engine Light used to optimize a vehicle's fuel-to-air mixture to increase gas mileage and reduce emissions — is the most common cause for a check engine. You could use a diode light to see if it’s coming any ground on that wire when the engine is running, but I recommend that you use an oscilloscope and you will probably not have one at home. There are many reasons why the light will show but a garage can check what the cause is. If the Check Engine Light comes on, you may find any of the following codes:. Started up and now only the red triangle and check engine lights were on. Brought it to Nissan and was informed it was a misfire on cylinder 2. A small amount of oil in the engine, even well below factory specifications, will circulate through the engine at a pressure high enough to avoid activating the sensor. Exactly what the OBD system looks for depends on the make, model and year. Get your check engine light problems diagnosed at Capistrano Mazda. It doesn't always mean there is a problem with the anti-lock braking system directly. Continued operation may cause serious engine damage. Could needing a oil change cause your check engine light to come on. So I called my dealer on my cell phone to ask what I should do, and ask if it was safe to finish my trip to daycare and home. Hi there! Now I don't know what you mean when you said ""a coil like one then underneath…" but fuel additives can trigger the check engine light. The reason for this warning is because a missing, loose or damaged gas cap is a major safety hazard. Check your engine oil. I am running liquid moly to try and get it loose. It could be a misfiring engine, a broken oxygen sensor or simply a loose gas cap. The possible reasons for this light are in the thousands. To diagnose many of the problems, you will need little more than a test light, a volt meter, a vacuum gauge and maybe a can of brake clean. Is it going to fall apart?! When Keri and I took a road trip, her check engine light popped on just when we were about as far from home as we could be on this trip. It could be something simple, like a loose gas cap or it could be something more serious. So I called my dealer on my cell phone to ask what I should do, and ask if it was safe to finish my trip to daycare and home. Unless the oil level is low enough to cause a drop in engine oil pressure, the oil light will not even come on. This could make ABS light to come on. Excessive oxygen readings in the exhaust will set lean codes. This valve or pump is more susceptible to damage probably due to internal wear and tear. My mechanic told me that it could very well be that the cold temperatures may be causing the gas cap seals to be stiff and not seat properly on the end of the filler tube. Taken in the next day due to it was after hours. It’s not cause’ the turbos don’t last…it’s cause’ replacing the turbo is just a band aid…the real problem lies somewhere else. If your check engine light is on, there's a good chance it's for one of these 10 reasons. When this happens, it causes your vehicle to fail the self-diagnostic evaporative emissions test it runs, triggering the check engine light to turn on. Generally speaking, there are 2 different groups of lights that show up. If the light goes off, we assume things are okay. In some cases you need to pull over immediately to prevent damage while in others you merely need to tighten you gas cap next time you stop in order to reset the service engine soon light. If this is the problem and you continue to run your vehicle with the Check Engine light on and the airflow sensor is failing, you'll be creating more problems. A check engine light is designed to turn on whenever any problem – and we mean ANY problem – with an engine is detected. Check engine light comes on and off during time that the vehicle is stationary or while moving. it started ok, idled for about 5 minutes, then sputtered and died. The Toyota parts man said their front flex pipe is part of the catalytic converter and is an over $2k install. There are many reasons why the light will show but a garage can check what the cause is. You can get that for free at most auto-parts stores. There are so many things that can be wrong with a car. " There can be a lot of things that can cause your check engine light to come on, but there are a few that are more common than others. What's going on? The car still runs well and idles fine. Replaced the coil pack on that cylinder. Unfortunately, when it comes to most modern cars, using cheap off-brand gasoline can also cause expensive problems -- the kind that can be chronic, and deadly for your car's engine. Unless the oil level is low enough to cause a drop in engine oil pressure, the oil light will not even come on. Much more likely that either the pump is on the way out, bearings are in trouble or, just possibly, Oil Pressure valve or sender is suspect. Hi there! Now I don't know what you mean when you said “"a coil like one then underneath…” but fuel additives can trigger the check engine light. When you see the check engine light it doesn't necessarily mean you need to pull the car over to the side of the road and call a tow truck. I've had this done at NAPA and Advance Auto Parts. Most repair facilities will check that at no charge. There are a variety of reasons for a check engine light to come on, which is why it tends to pop up more frequently than other lights, which tend to be very specific. They can also annoyingly come on and cause lots of panic even though nothing is really wrong or if the problem is quite minor. The check engine light doesn’t just come on for no reason. It can also cause a car to experience impaired gas mileage, increased emissions or frequent stalling. Recentley my check engine light came on in my lacrosse while i was driving on the freeway. This could also be the case if the. " This begs an all-too-common question: what causes the Check Engine light to come on? We've seen these lights for ages, and we're pretty confident that we know the top five reasons a check engine light comes on. Can extreme cold temperatures cause the check engine light to come on? (2005 Chrysler Town & Country) We are going through some extreme cold temperatures like 3 and 5 degrees with wind chill of minus 13 the last few days and for Oklahoma this is extremely unusual. It comes without warning and with no explanation. It could indicate a major problem that requires stopping the vehicle immediately to avoid a costly engine repair. Check Engine Light-Fault Code:P0420-2(four possible causes?) Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. The check engine light could come from a variety of reasons around the engine, fuel and exhaust systems. The 2009 Dodge Journey has 8 problems reported for check engine light. Repair costs for. But some reasons the check engine light comes on are much more common. Sure, there are some owners that sleep well at night even when their check engine light is on, but there are a lot of people who can't sleep when their auto has a problem. Here's what you need to know when it comes to the check engine light and the evaporative emission system. As a result, the vehicle may experience performance problems that trigger the check engine light. ) Second, the warning light may fail to go out when you raise the engine speed. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. Typically an intermittent check engine light concern happens under very specific conditions such as when it's hot, cold, damp or driving over bumps. com : Car complaints, car problems and defect information. Loose fuel cap or damaged cap. If the oil is low, you could be incurring engine damage. Get your check engine light problems diagnosed at Capistrano Mazda. This afternoon, while running errands, the Check Engine light had shut off and it seemed to be running just fine. Low engine oil is actually a rare cause of an oil light coming on. One thing that can really throw us for a loop is when the check engine light comes on in our vehicles. First, the warning light bulb may fail to illuminate when the ignition is switched on and the engine has not yet been started. What are any problems that could/might be related to the ch. However, it is generally not a cause for the check engine light to come on. Check the gas cap also, since there's reason to pay us to figure out the gas cap is loose. Check engine light is the most common indicator light that appears on dashboard. The "Possible Causes" is the list of all the items, components or circuits that should be inspect, test, repair or replace to fix the OBDII code. 18% of the time, CarMD says; the cost of a new cap is. I’ve heard about a “code” that the sensor stores. Unless your car starts smoking or completely stalls, you can visit an auto parts store and have them run a diagnostic to find the cause of the check engine light. Don't panic! A check engine light rarely signals anything disastrous. Worn timing chains; timing chains and guides require replacement of old chains which were still used on the Traverse built in April 2010. Less common are either a red light, or flashing yellow. What Problems Can Trigger the Check Engine Light? Ranging from minor to major, a slew of things can trigger the check engine light to come on in your Volvo. In any case, if the check engine light is on in your car, it’s time to schedule a service appointment. My mechanic told me that it could very well be that the cold temperatures may be causing the gas cap seals to be stiff and not seat properly on the end of the filler tube. That would be the reason your vehicle did not start when you tried it. I have two problems. it goes out. The Toyota parts man said their front flex pipe is part of the catalytic converter and is an over $2k install. To clear the confusion, we need a basic understanding of what the check engine light is trying to tell us. One final note: you may want to browse a complete list of the check engine light codes that might possibly show up when you check to see what your problem is. i need to get the oil changed, but have not noticed any problems otherwise. The check engine light comes on when an electrical / electronic issues in the engine management system. Check Engine Light is on; Check Engine Light flashing. For most drivers, this means a trip to the mechanic, but it's not difficult to diagnose (and sometimes fix) yourself. Steps to Take to Diagnose a Land Rover's Check Engine Light Desert Oasis Auto Repair August 19, 2016 Land Rover You're driving your Land Rover and everything seems fine until all of a sudden the "check engine" light comes on. You can also check the fuel pressure, but in that case, it would probably run badly on several cylinders. Sometimes, this warning means you're going to need a major repair. If the check engine light flickers on in your 2016 Toyota RAV4, be sure to check the condition of spark plugs and spark plug wires. If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak. now my check engine light is one and when i went to get the code checked it truned on my engine and i coulnt turn it off. Chevrolet has many documented blogs of these timing chains being bad but still used them in their builds. Having the “check engine” light turn on can be an unsettling experience. Every so often the engine will start to run a bit rough for a bit and the check engine come on. The knock sensor retards or advances your timing based on engine noises, which will throw up the P0340 for the camshaft positition sensor. It would most likly cause missfire codes. Usually, it happens soon after a fill-up at a gas station. You can get that for free at most auto-parts stores. What will cause the engine to stop running while driving and the check engine light does not come on when engine stops running? It could be fuel pump, fuel filter or out of fuel. Just clean the cannister with pressurized air. 4 Common Reasons the Check Engine Light Comes On There are many, many reasons that the check engine light may come on in you car, truck or SUV. and if your dealership is too far to drive to, any Autozone will pull the codes for free. Took a total of 45 seconds. LIGHT CAME…. Your engine requires a steady supply of oil to keep all of its moving. Unless your car starts smoking or completely stalls, you can visit an auto parts store and have them run a diagnostic to find the cause of the check engine light. Less common are either a red light, or flashing yellow. check engine light every 1 is talkin about this problem with the egian light its funny how people it happens to. What to Do When Your Check Engine Light Comes On. Common Check Engine Light Causes Here is a list of the most common check engine lights (CELs P Codes) and their common causes and common symptoms. Usually within a short time, or a few miles of driving, the check engine light comes back on. Check your engine oil. A car's spark plug. She pulled into this gravel parking lot, in the dark, and apparently there was a decent bump between the pavement and the gravel. And seems to stay off until the next time I start her up. Warning lights can sometimes burn out at the same time, too, for the same reason. In other cases, it could be a more serious leak in the upper portion of the fuel system. The engine runs fine, the only difference I have noticed is that the oil pressure gauge reads much higher now. One thing that can really throw us for a loop is when the check engine light comes on in our vehicles. Since the check engine light is on the computer needs to be scanned for codes. If the oil is low, you could be incurring engine damage. Best Answer: No, the check engine light does not come on because of low oil level. It is usually accompanied by a P0340, since the knock sensor will not cause your warning light to come on. A loose, cracked, or faulty gas cap can cause fuel to evaporate, thus causing your check engine light to come on So pull over (as soon as it's safe) and make sure your gas cap is on tight. It is important to replace the battery if this is happening, because it can deteriorate to the point where it can ruin the alternator as well. It comes without warning and with no explanation. Fuel injection systems supply fuel directly to the cylinders of a vehicle's engine. The "check engine" light has come on to You get into your vehicle ready to run some errands or head off to work. The most recently reported issues are listed below. If the wires are worn out, you might want to get them replaced at the earliest. A malfunction indicator lamp ( MIL ), or check engine light , is a tell-tale that a computerized engine-management system uses to indicate a malfunction. A shorted battery will cause your check engine light to come on as well as the ignition start light, and you won't be able to jump start the car. When the check engine light is illuminated because of an oxygen sensor, you’ll need to determine which one is faulty. "Check engine" light was on, but now it's off. Check engine light comes on when gas cap is loose or completely missing, spark plugs or plug wires are damaged, vehicle has a bad catalytic converter, oxygen sensor needs to be replaced. If you're not sure, consult your owner's manual. Because of the reasons, even in electric power steering systems there is a separate warning light, and power steering issues will not light up the check engine light. Shut off the engine as soon as possible. Many times if the engine also stalls, there could be excess carbon build up on the throttle plates or IAC (idle air control motor). In this case, if you don't know how to reset check engine light, here are 4 useful way for you. A cold morning in fall can cause an annoying idiot light to come on in your car. Could needing a oil change cause your check engine light to come on. It would most likly cause missfire codes. It could be anything from an EVAP leak to a transmission problem. Check engine warning light. So you've got a check engine light concern that only happens sometimes? There are a few things we can do to help duplicate and find the concern. Usually, it happens soon after a fill-up at a gas station. Oxygen Sensors, otherwise referred to as O2 Sensors, and their related check engine light codes, can be troublesome at the very best! Today we discuss the design and function of these sensors, and some of the pitfalls encountered during the diagnosis of their related fault codes. There is a reason Subaru installed the check engine light and it is in your best interest to pay attention to what its telling you. If your car is smoking or making a unusual noise and the check engine light is on, it may indicate engine trouble. Check your engine oil. Your Check Engine Light may be indicating a simple problem that’s easy to fix—such as a loose gas cap that needs to be replaced. Generally, there are a few more common issues that have lead to your engine light causing you stress; we at Citywide Towing would like to list those frequent problems. There's a world of difference between the two. The Check Engine light or Service Engine soon light is one of the most misunderstood warning lights on a vehicle dashboard. If I turn the engine off and back on again, the light will go out for a few minutes and then come back on again. The first step in the diagnosis is an oil level check. But if your vehicle is experiencing some of the other common reasons for a check engine light to come on, you could be worsening the damage and increasing your repair bill. The service engine soon light is often confused with the check engine light. According to this engine’s account, which is around 6 right now, inmates are in the dark until the sun comes up again, roughly 10-12 hours later. How the "Check Engine" light works. Dirty air filter could be causing the engine to starve for air and run lean and cause the engine light to come on. Again, it might take a little while after tightening the dipstick before the light goes off. What's this for? The check engine light is part of a system that constantly monitors diagnostics relating to emissions, engine efficiency and fuel efficiency, among other things. The code P1693 is a Toyota-specific code described as OCV Closed Malfunction. To clear the confusion, we need a basic understanding of what the check engine light is trying to tell us. Now each time I pull away, the Acadia hesitates and it also makes the clucking noise. So you've got a check engine light concern that only happens sometimes? There are a few things we can do to help duplicate and find the concern. Below is a list of a few of the possible problems that could cause your check engine light to activate. I have a 1999 Escort ZX2 with the 2. Less common are either a red light, or flashing yellow. I've tried using mid-grade gas, in the 89 octane range and noticed no problems with performance, but have on oacasion had problems with the check engine light, and codes relating to fuel mixture. A second or two later the check engine light comes on in yellow for about 3-4 sceonds,then goes back off. Since then, the Check Engine light has come one and gone off again more than once, and I've noticed that when the temperature is mild, it goes off. Problem 1) When I put on the brakes, my oil light comes on and my oil needle drops all the way down like I don't have any oil (but I do have oil). Having the “check engine” light turn on can be an unsettling experience. This misfire can also cause the oxygen senor to over compensate (due to the miss) and go haywire which sets an oxygen sensor failure code AND the original engine misfire code. Posted on Oct 23, 2010. Could a broken PCV valve cause the "Check Engine" light to go off? Answer. The Toyota VSC light comes on when there is a malfunction with this VSC system. A MIL "Check Engine" light on a Volkswagen Bora indicating a fault in the Engine Management System. There are a variety of reasons for a check engine light to come on, which is why it tends to pop up more frequently than other lights, which tend to be very specific. Take Back Control of Your Fleet with LDT! If you’re check engine light has essentially become your maintenance scheduler, then Lloyd Diesel can help. or sometimes it takes a few day the check engine light comes on, and as soon as I put it in gear and move like 10ft. Steps to Take to Diagnose a Land Rover's Check Engine Light Desert Oasis Auto Repair August 19, 2016 Land Rover You're driving your Land Rover and everything seems fine until all of a sudden the "check engine" light comes on. Knowing if we should continue driving or stop right now is difficult. If you car sat for a while, your "check engine" light could come on because a sensor or solenoid is stuck, or for other reasons. Critters move in, batteries go dead, tires go flat, brake rotors become rusted and cause a pulsation when applying the brakes, pulleys rust and cause belts to squeak, and the list goes on. In general, five common malfunctions can cause the check engine light to come on, and some of them are simple to fix yourself. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. Ranging from minor to major, a slew of things can trigger the check engine light to come on in your Mercedes-Benz, including (but not limited to): Loose gas cap. the truck had been sitting for about 6 weeks. The corrosion in the wiring and connectors of the car computer system is another major cause of the Check Engine light problems. Wondering what could cause the “Check Engine” light to come on? Contact our ASE Certified technicians at Dependable Car Care for more information about engine service and to schedule an appointment. The cars keeps going into limp mode. Next steps: Stop the vehicle in a safe place, turn off the engine and contact us to report your breakdown. A malfunction indicator lamp ( MIL ), or check engine light , is a tell-tale that a computerized engine-management system uses to indicate a malfunction. Can extreme cold temperatures cause the check engine light to come on? (2005 Chrysler Town & Country) We are going through some extreme cold temperatures like 3 and 5 degrees with wind chill of minus 13 the last few days and for Oklahoma this is extremely unusual. most likely thing loose is the gas cap. The engine light still went on, so I proceeded to go to the dealer. When I came back in after 1. Common Causes of the Mazda Check Engine Light Turning On. I was wondering if this is true. Usually within a short time, or a few miles of driving, the check engine light comes back on. I replaced the PCV ($3. If the oil is low, you could be incurring engine damage. If the mounts weaken or break, heavy vibration or shaking will be experienced. Could needing a oil change cause your check engine light to come on. Another reason for the ABS light to come on is ABS module itself being faulty. When P0300 occurs, it should be fixed immediately as long term driving with engine misfires could cause consequential damage to your engine and catalytic converter(s). We’ve briefly touched on what your dashboard warning lights means, but there’s one light in particular that can cause the most frustration: the check engine light. One final note: you may want to browse a complete list of the check engine light codes that might possibly show up when you check to see what your problem is. An intermittant sensor problem on most vehicles still causes a trouble code to be stored in the computer. If the seal is broken due to a loose or damaged gas cap, the vapor could be leaking into the fuel-tank system, which causes the check engine light to turn on. I've heard about a "code" that the sensor stores. ? im not sure the last time it had a oil change its running fine but for some reason my check engine light came on. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. How Cheap Gas Destroys Your Car's Engine. Even though you may feel no difference in your car's per-formance, it can reduce your fuel economy and cause your car to put out excessive emissions. The check engine light comes on and the car makes noise and driving is not smooth. Many times, P0300 occurs when there are worn out spark plugs, spark plug wires, or a faulty ignition coil. Replace Oxygen Sensor. If the oil is low, you could be incurring engine damage. It is usually accompanied by a P0340, since the knock sensor will not cause your warning light to come on. If it looks like it's in bad shape, it should be replaced. What to Do When Your Check Engine Light Comes On. I thought maybe it was bad gas but since the lights been on ive filled my tank all the way up and nowits at half a tank and the lights still on. Warning lights can sometimes burn out at the same time, too, for the same reason. most common causes - gas cap & oxygen sensor The two most common reasons for a check engine light to illuminate is a loose fuel cap or a problem with an oxygen sensor. Don't panic! A check engine light rarely signals anything disastrous. A diagnostic tool will tell you which system is at fault, and then you can perform tests to find the exact problem. Check engine light just came on 3 Answers. It could be a misfiring engine, a broken oxygen sensor or simply a loose gas cap. And seems to stay off until the next time I start her up. As a result, the vehicle may experience performance problems that trigger the check engine light. SOURCE: My check engine light came. A loose gas cap or low oil level can cause the check engine light to come on. Thermostat. John Krebs, Service Director at Lehighton Ford, goes through the five most common reasons your check engine light may come on in your car or truck. com : Car complaints, car problems and defect information. Let’s take a look at the most common issues. Blinking check engine light is not good at all. For example, if you just refueled, the problem could be something as simple as a loose or broken gas cap, a quick and safe fix. Some vehicles include F-150, Ranger, Taurus, Mustang, Explorer, and Escort. One of the causes of this internal wear could be the dirt brake fluid. Most Common Causes of a Check Engine Light and What You Can Do Check engine lights have a way of sticking in every owner's mind. Wondering what could cause the check engine light to come on?. Recently my check engine light came on, and has stayed on steadily. Unless the oil level is low enough to cause a drop in engine oil pressure, the oil light will not even come on. For most drivers, this means a trip to the mechanic, but it's not difficult to diagnose (and sometimes fix) yourself. Could a restricted fuel filter cause the check engine light to come on - I suspect there may have been bad fuel added. There are literally thousands of things that can cause a check engine light to come on. The cap is a crucial part of a car’s fuel-delivery system. A solid check engine light can be something harmless, or something serious. I decided to replace the air filter and see if the check engine light would still come on. Loose fuel cap: Before you start looking through all sorts of vehicle components, first check out the gas cap. Some vehicles have a 'check fuel cap' warning or a Service Engine Soon light that may come on for the same reason. When you take your car to the mechanic, he will test your car’s battery before doing any further diagnostic testing. If it were misfiring I imagine I would really know it, VWVortex. Could have a problem with voltage regulator, possibly a stator (hope not!!) 2002 FLSTCI, speedo looses power comes back. There is a multitude of problems that can happen if either the electronic accelerator pedal, or electronic throttle body have an issue. Steps to Take to Diagnose a Land Rover's Check Engine Light Desert Oasis Auto Repair August 19, 2016 Land Rover You're driving your Land Rover and everything seems fine until all of a sudden the "check engine" light comes on. I've had two friends who drove a few miles with this light on and burned up their engines. Common Causes of the Mazda Check Engine Light Turning On. Although these coils can simply wear down over time, the number one cause of faulty ignition coils is voltage overload caused by bad spark plugs or plug wires. The engine runs fine, the only difference I have noticed is that the oil pressure gauge reads much higher now. " There can be a lot of things that can cause your check engine light to come on, but there are a few that are more common than others. Top Reasons Why your Check Engine Light is On. The converter may be malfunctioning, or you may have a problem with your engine. Please don't read that as an excuse to procrastinate! Driving in spite of a check engine light for days or weeks (or months) could cause serious damage. The check engine light doesn’t just come on for no reason. One glorious autumn morning in September 1992, with Mount Rainier’s snow-capped peaks rising up against a deep blue sky, I packed my flight bag, going through the checklist in my mind: License. Read on to discover some of the most common causes behind a check engine warning! Common Reasons For A Check Engine Warning. I am glad that you checked the oil though before it caused any issues. When I came back in after 1. Exactly what the OBD system looks for depends on the make, model and year. Check your gas cap. Since all of the other causes usually require major engine service, you should verify that the engine actually has low oil pressure (thus causing the oil light to come on and stay on). She hit it rather hard and the check engine light came on. If your engine had a lot of gunk on the intake portion of your engine, then this burning off can trig. There is excess water in your engine. To diagnose many of the problems, you will need little more than a test light, a volt meter, a vacuum gauge and maybe a can of brake clean. What to Do When Check Engine Light Comes On. If the Check Engine Light comes on, you may find any of the following codes:. I took it to the dealership today and waited for 3 hrs for them to diagnose it and they could not find anything. Gps shut off device causes check engine light to come on The dealer put on one of those gps tracking device that shuts off the engine if payment late. ) Second, the warning light may fail to go out when you raise the engine speed. How to Respond When Your Car's Oil Light Goes On. Engine Stalls (Check Engine Light May or May Not Be On) Stalls typically occur when the engine is idling or slowing. This afternoon, while running errands, the Check Engine light had shut off and it seemed to be running just fine. If the gas cap is damaged, loose or askew, sensors can detect that the system is not sealed properly and trigger a warning. The car runs really bad, and we replace the timing chain and the cam sensor. Meaning of check engine light in Nissan models. It could be anything from an EVAP leak to a transmission problem. "When the check engine light comes on, a lot of times people are more interested in getting the light to shut off than addressing the actual problem. Your Check Engine light is shining like a beacon of bad news. This driver is in the USA and is sure about the 87/89 octanes. Most repair facilities will check that at no charge. They did a diagnostic and said it was a spark plug miss firing. i have a simalr problem my light comes on when it is worm and makes the car jump around does any1 have a clue whats wrong?? thnkz. the best thing to do is drain the tank of all the bad fuel. And your recommendation is ?????. Injectors N30-N33 can also cause the EPC light to turn on and cause car to go into "limp mode" but also causes the engine not to run smoothly. At times the Check Engine light could come on for minor issues such as not tightening the gas cap properly. Most repair facilities will check that at no charge. The first thing we advise is confirming that it is the 'Service Engine' or 'Check Engine' light. If the light goes off, we assume things are okay. Well there are a series of tests that your. A check engine light is designed to turn on whenever any problem - and we mean ANY problem - with an engine is detected. Solving Check Engine Light Problems. Could be bad O2 sensor, could be loose gas cap, could be MAF. Hi,my Jetta 2004 automatic transmission has EPC and check Engine lights on,it starts and drive's but can't change to the next gear. the truck had been sitting for about 6 weeks. I have a 1998 Chevrolet S10 my check engine light will not come on I replace the bulb still nothing anybody got any ideas please let me know could it be a wire they cut at the computer 05/01/2018 by Marvin Hobbs. This will let you know when there is an excessive concentration of carbon monoxide being emitted through your exhaust system. Can a dirty air filter cause a Check Engine light on a Saturn L200 to go on? Reply 1: I have never seen that happen if you could go to a auto parts. Since then, the Check Engine light has come one and gone off again more than once, and I've noticed that when the temperature is mild, it goes off. Less common are either a red light, or flashing yellow. Blinking check engine light is not good at all. While the light says “check engine” the reality is that it could be 100 different things that are triggering the fault causing the light to go on. It would most likly cause missfire codes.