Vacuum leaks, oxygen sensor failure, and catalytic converter efficiency faults can cause the Check Engine Light to illuminate.
Resources for the Repair and Maintenance of your 2003 Audi A4 Quattro
2003 Audi A4 Quattro
2003 Audi A4 Quattro Problems
A problem with the torque converter can cause the Check Engine Light to illuminate.
Erratic turn signal operation can be a result of a failing turn signal flasher relay which will require replacement.
The digital display portion of the instrument cluster may fail. Our technicians tell us the entire instrument cluster will need to be replaced to correct this concern.
Our technicians recommend having the constant velocity (CV) boots and CV joints inspected at each service. Servicing torn CV boots early can prevent the need to replace the CV half shaft or CV joint.
2003 Audi A4 Quattro Questions and Answers
Do I have to used Audi spark plugs or can I use plugs recommended from Advance Auto parts?
I have a problem with the starter or battery because for some reason my car will start in the morning fine but i will turn it off for an hour and when i try to start it again it takes a long time t...
The a/c simply quit working. Have had it tested for coolant leaks, nothing. The A/C compressor is working properly. My mechanic has hooked up computer and ran diagnostics and all the messages com...
My car has only 36,000 miles on it, but the dealer is recommending I replace the timing belt because it is now 7 years old, and that is the recommendation in the manual. Do I need to do it this so...
2003 Audi A4 Quattro Reviews
My Audi A4 is excellent. It has 92.000 miles and continues in perfect condition. I drove it in Italy for a year and a half (miles a day - 110 - speed 110 to 120 miles per hour. I love my Audi A4 Quattro- is excellent.
this is a fun car, that's awesome in the winter. Unfortunately since it's an audi it can be pretty unreliable, and repairs will cost you an arm and a leg. So if you are going to get this car, make sure you have a carassistants.com subscription. They probably saved me close to $5K in repairs so far.
I bought my 2003 A4 Audi at 95,000 miles. I bought it with a leak in the rear flange and it needed a new clutch. These 2 repairs together cost $2k My Audi now has 105,000 miles on it and I have not had any other problems with it. I drive it like a grandma shifting between 2500 and 3500 rpms depending on the roads speed limit and weather conditions. I test the acceleration about every 500 miles. Everything seems to be going great I drive approximately 150 + miles a day on average and I have change the oil twice and getting close to time to change it a third time. My oil still looks good and new when I change it :) I want to take good car of my car and I hope it last a good long time.
I love my Audi A4. With Quattro you can gun it through turns and live to brag about it to your friends. After owning the car for 3 years I still love taking a 35mph turn at 65 and laughing confidently as the tires grab the road and whip you forward.