I recently bought a 95 A6. After a heavy rain I had to tow it to a dealer. They found the drain lines clogged with leaves. They say it affected ecm and I had to replace it. Only 2 weeks later after a heavy rain it happened again and they now say there is a mold on the wires causing it to corrode. Now I must replace the O2 sensor and they suggest I sell the car.
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jimkutt@netscape.net