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Why does the check engine light come on but the car still runs?
Wiki User
∙ 16y ago
This condition is a "limp in" mode programed into your cars computer so that it still can be driven even thou a problem has been detected. In this mode the engine runs on preset program that does not require feedback from sensors on the engine to run. This "OPEN LOOP" mode does not update the computer as conditions change, therefore, performance and gas millage suffer, along with some other issues.
Have a code scan performed to see what trouble codes are stored. After locating and correcting the problem the check engine light can be reset and the engine can then run in "CLOSED LOOP". I hope my very basic answers help you to understand why you dont have to have your car towed to a repair shop !
Wiki User
∙ 16y ago
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Does the check engine light come on because your gas is halfway full?
No, the check engine light does not come on because your gas is half way full. The check engine light will come on if there is a problem with the engine.
Check engine light won't come on?
If an check engine light does not come on it is a good thing. When your check engine light comes on, it means you need service done on your vehicle.
Will the check engine light come on if you take the seats out of a 2005 Hyundai elantra?
No the check engine light will not come on
Why does the check engine light still come on after the gasket was changed?
Did you reset the light? I don't know what gasket you changed, but undoubtedly that was not the problem. The check engine light comes on when there is a problem with the emissions system.
Why does the check engine light still come on even after you changed the O2 sensor and reset the check engine light on a 1996 Lexus ES300?
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.
Will the check engine light come on with no oil in the car?
No, the check engine light has nothing to do with the oil level in the vehicle. The check engine light will come on when there is a problem with the emission system. The red oil warning light will come on if your vehicle is low on oil.
Check engine light on but running fine?
Generally the check engine light will come on when the car is need of a tune up. It may run fine, however, the vehicle should still be inspected.
Would light come on if problem with catalytic converter?
If it has a downstream O2 sensor the check engine light will come on but if it does not the light may not come out. In most instances it will set the check engine light.
How do you reset check engine light on 1999 cadillac deville?
The check engine light on a 1999 Cadillac DeVille can be reset by disconnecting the battery for 30 seconds. The light will immediately come back on if the problem still exists.
Check engine light will not come on?
95 s10 blazer has a miss and check engine light does not come on and exhaust smells gassy what could it be
Why do a check engine light come on in a 96 Bonneville?
There are lots of different reasons a check engine light can come on does the car feel any different?
If your transmission goes bad will your check engine light come on?
It will usually come on. The speed sensor on my transmission died and it displayed the check engine light.
