Question about 2002 Audi A4
This is a common problem with your shape A4, pre 2001 A4s and old shape A6s. Rain water builds up in the area under the bonnet where your battery is. This can be accessed by removing the long black trim under the windscreen covering the battery. This area has two drain holes with small rubber tubes on it, these tubes get blocked over time by leaves, dirt etc. They need to be unblocked, and the tubes can be completely removed (and left off). This is much easier to do underneath the car but at least one can be done from the top. Its under the battery though. Be aware when you disconnect the battery, you will lose your radio coding.
It needs to be done though as if the water is coming in the car then it must be high. The water has most likely damaged your convenience control unit (electronic control unit) under the carpet of the footwell, this controls the failed electrical items you described. The water can cause further problems, electrical as it submerges the battery! And brakes as the brake servo can **** the water in causing many problems! Well worth getting it out sooner rather than later. Hope this helps and hasnt scared you too much. Good luck
Posted on Jan 23, 2009
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Posted on Jan 02, 2017
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