Just happened now on the Audi A4, and this is not the first time.
This phenomenon happens every few months on the Audi A4 after a car wash.
The first time it happened I got worried, had to fix an appointment with a mechanic, who diagnosed and found nothing was wrong. (If nothing was wrong why did the lights come on after a car wash?)
I bet you even Audi cannot answer this question.
Just do a Google search P2138 car wash and see how many other people are facing this same problem.
I have actually spent thousands of dollars replacing the Throttle Body and Pedal Position Sensor on the Audi A3. Could I have saved all that money if I was wiser then? Probably.
Thankfully I now have less money to spend with car dealers, but more importantly,
I have the Torque App.
Here's how I fix the EPC and Check Engine lights on the Audi A3 & A4
Looking forward to helping others who have these problems on their cars.
Happy driving friends!
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