Two problems related to check engine light on have been reported for the 2003 Audi A4. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Audi A4 based on all problems reported for the 2003 A4.
I have had numerous problems with my A4. First, my headlight shorted out and cost over $600 because it fried all the electrical wires and I had to get a new headlamp setting and wires. Even after replacing the computer has a lightbulb signal light that it is not sending the correct ampage. The power steering leaks continuously and makes noises also. The check engine light has came on and the motor is running very bumpy like almost like it is mis-firing or something. And last but not least, the transmission is not running correctly. When I put it into reverse it stalls and will not go. I put it in to neutral, then reverse again and it slowly catches sometimes. Now the check engine light is flashing and I have had my car sitting for a few days after all this suddenly appeared. I am saving money to try to get this fixed. I am afraid that the engine will stall or I wont be able to turn due to the steering and crash so it is inoperable at this time.
The contact owns a 2003 Audi A4. While driving 38 mph, the check engine soon light illuminated and the entire vehicle began shaking. The vehicle had to be towed to the dealer, but has not yet been diagnosed. The contact also noticed smoke coming from the engine compartment. He checked the vehicle and discovered an engine leak. He took the vehicle to the dealer and they informed him that the vehicle had been repaired; however, the contact does not believe that anything was done to the vehicle. An independent mechanic stated that the shaking was due to the motor mount. The current and failure mileages were 35,600.