The only thing worse than an illuminated check engine
is having it turned off but still seeing an error code! Whatever prompted the error code may not have occurred enough times to trigger both the check engine light and an error code to switch on, so you should use an OBD2 scanner to properly diagnose the issue. If you’re having trouble identifying the problem yourself, you should see a mechanic.
A pending engine code will trigger an error code but not the check engine light. Pending engine codes indicate that your car is aware that there’s something going wrong with it, but that it’s not a damage-causing issue yet.
There are a couple of other reasons why the error code could remain after the engine light has turned off, such as:
Problem was solved on its own
The code is left over in your engine’s long term memory
Electrical issue stopping the check engine light from illuminating
The issue is non-emissions related
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