GM Repair Problems? Ask GM Repair Expert Now.
Can you give me the code that sets when the engine light comes on?
Your mechanic is guessing about things like the airbox lid.
You may need to take it to a better workshop.
What engine in your car?
I will come back with some more info shortly.
Ok, I'll be back soon.
There are many reasons for why and how this may happen.
Here is the diagnosis for P0171 and P0172, as a start.
Do they have a GOOD scan tool to observe O2 sensor activity?
Do you need any further help?
I hope my advice has been of assistance to you.
How did you go with your problem?