One problem related to underhood wiring has been reported for the 2002 Audi A6. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Audi A6 based on all problems reported for the 2002 A6.
Driving from NJ to upstate NY for ski trip to hunter mountain. Heavy rain during drive up on Friday evening, rain all day Saturday. Got in the car to go skiing on Sunday morning and noticed several inches of water in rear passenger footwell. I was able to bale out some of the water but interior carpeting was soaked. While going to hunter, water was sloshing between passenger footwell and rear. After dropping off the skiers I decided to head home on the NY state thruway. After approx 50 miles - digital dash display disappeared, car started to jerk around and buck. Speed was dropped down to 20 mph, I was able to make it to a rest stop. Anyway - remainder of ski party picked me up and I had the car towed back to NJ - $700. Mechanic states that tcu unit was under water. Rain water apparently came in through the pollen filter housing and flooded the car. Total damage to the car $2300. There are a number of complaints throughout the internet and various forums detailing this exact problem. I believe this is a design flaw and Audi should be held responsible for this problem. I'd like to get reimbursed for my cost. Individuals with this problem should contact Audi customer service at 800-822-2834.