Intermittant problem. The " check engine light" is by far one of the most misunderstood technological advances by the public. This is an needed in-depth understanding for the public. It is a warning light that is illuminated when there is a problem affecting the EMISSION SYSTEM only. Emission system being the pollution control system. Don't get a hard on against it as it is a good thing once you understand it. One point that was brought up a a recent meeting of technicians was that the amount of hydrocarbons is greater when the gas cap is left off than when the engine is running. Hydrocarbons are part of pollution emitted as gasoline evaporates. Going a step farther, one facet of the emission system is the "Evaporative" portion. This is when the fumes from the gasoline are leaking from the system into the outside air. This is one part of the emission system that can trigger a check engine light. I would say that about 7% of the vehicles that have a check engine light are the result of a loose or inadequate gas cap. But understand that many scenarios are possible with the "check engine light" The vehicle's powertrain computer (note that some vehicles have 17 different computers) will run a series of self-tests. They will only run under certain criteria. And they can be vastly different from manufacturer to manufacturer. Some self-tests are not run until preceding ones have run successfully. So if there is a problem in one particular area that is preventing another self test from running, you can have a situation where one problem is fixed, but another still exists. If you fix a problem and drive the car through a drive cycle that sets the monitor (or self test) the light will go off as it passes that criteria that triggered it in the first place. After 1996, the auto industry went to a idea called OBD II (on board diagnostics). This was to get all the manufacturers onto a similar plane for troubleshooting and powertrain control. While they still differ vastly, many corrections and adaptations were made for technicians to better fix the check engine light problems. Prior to this there were so many different and poor troubleshooting data from a check engine light problem that resolving the problem was much more difficult. Many early warning light of this nature were set to illuminate based on mileage. An Oxygen sensor was one of the things that were meant to be replaced when that mileage was hit. This is much like many current "Change oil lights
The check engine light does not generally have anything to do with the check oil light. The oil light just indicated it is time to change the oil, while the engine light indicates a problem.
A quick way to reset the check engine light would be to disconnect the battery for a short while
Check the engine oil, sometimes when the oil is low the check engine light comes on while sitting still and goes out when you accelarate.
start with engine off. press and hold that speedometer resetter while starting engine, check engine light will flash a few times then disappear.
engine is about to stall
A check engine and maintenance light have different symbols. The owners manual of the vehicle will decipher what each symbol means. A service light means a vehicle has a service that due while a check engine light requires some sort of repair.
An engine cylinder misfire has been detected if your check engine light is flashing ( I'm not a mechanic / technician but it could be a spark plug , spark plug wire , the fuel mixture , or some other problem )
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
There are pages and pages and items that can cause a check engine light. You need to have it checked for codes with a scan tool. After repair light can be shut off with scan tool.
Have vehicle scanned to see if any codes are stored to determine the problem
Anytime the check engine light or brake light comes on you should have it checked for safety reasons.
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. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to a parts store or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.
what causes the rear lights to stay on while engine is running. the car is park
What did the check engine light codes say was bad?
Replacing the battery should not have triggered the check engine light. The check engine light comes on when there is a problem with the emission system. Saying that, I would drive it for a while to see if the light does go out. If the light does not go out have the ECU scanned to retrieve the trouble code. Then use this code to diagnose the problem.
If the check engine light is flashing with the engine running , that means a spark plug misfire has been detected
Remove the battery head(+v) for a while, then replace it and star the engine.
could be a MAF or something else electrical . i suggest to take in a autozone and get it checked for free.. just tell em your check engine light is on
One of the control devices is malfunctioning on the engine, and it needs to go to a shop for repairs. Simple things first though. If the light just came on, check to make your gas cap is on correctly, leaving it loose will cause the check engine light to come on. The light will reset itself after awhile of normal driving. If it does not have your local autopart store or shop read the code. That is the simplist way. Does the engine sputter while driving? That is an electrical problem with the spark plugs not firing when they should or not at all. Change the wres and plugs, check timing. That is what happened to mine
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. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area. A flashing check engine light is usually an indication of a severe misfire.
Most likely the alt. not charging. Check it with a volt meter on the battery while the engine is running. Should read 14 or so volts.
You don't want to do that. If your cars check engine light is on, you need to get it examined by a mechanic. Also, if you disconnect any battery terminal, your engine will not start or power any electronics while it is running.
That is commonly known as the "Check Engine" light. The light is on because the vehicle's on board diagnostics as detected a problem. Have a trusted mechanic take a look at it soon. If the "Check Engine" light ever flashes while you're driving, stop the car when it is safe to do so and shut off the engine immediately. If you continue to drive the car with that light flashing you risk doing serious expensive damage.
it could be your emission check sensor