Question about 1998 Audi A6

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98 audi currently my car is in fail safe mode . now my check engine light is on.i had the computer read the codes and it was saying my transmis contr is missing a message from my power tran. now i notice some water in the passager side of the car. what causes this and how i can fix the problem?

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This is caused by either a plugged drain line in your heater system. When the A/C is running, condensate is produced and it drains out the bottom of the car. You can see water puddles under cars that are running in the hot summer, that is what it is from. Check the drain by blowing air up thru the hole under the car. OR it can be caused by a plugged drain located under the battery in the engine bay. This hole plugs with leaves and overflows into the car and floods the under carpet area where the TCU is located. If you remove your battery to unplug this drain, remember to have your radio code or you will be in safe mode and it will not work.

Posted on Feb 05, 2009

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