One problem related to power train driveline has 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.
2003 Audi A4 cabriolet has had numerous issues, failure of door gasket seal which destroyed plc, resulting in horrible sound safety issue, cost over $2k to fix, failure of cv joint which could cause wheel to fly off, failure of rear glass window that could come loose hurting other vehicles or passengers of car; car has less than 70k miles, was bought new and is garaged. Audi America should reimburse owners for these numerous, (and apparently inevitable, judging by what I've read and heard from other owners) problems.