One problem related to other fuel system fuel gauge has been reported for the 2000 Audi A4. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2000 Audi A4 based on all problems reported for the 2000 A4.
Fuel sending unit malfunction on 2000 Audi A4. Affects sedan and avant models. Results in fuel gauge reading approximately 1/4 tank lower than actual fuel level. Note: a6 model has been recalled for this issue, and over 50 A4 owners have informed me (via web) that they experience this problem, but Audi has not issued a recall for the A4, despite admitting that it uses the same sending unit components.