Have you ever driven through a car wash and seconds later the EPC, Traction Control and Check Engine lights all come on?

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!