Question about 1999 Audi A4

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Air pump running when the key is off

1999 A4: The air pump, under the air filter box in the right front of the vehicle, stays on or runs intermittently when the vehicle is turned off which drains the battery. The plug at the pump has constant power and ground. which one should be constant? Is it direct sensor controlled or relay controlled? where is either located? What does the air pump do?

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  • deerhuntr4li Feb 07, 2009

    same problem with a 2000 vw passat

  • schommer_1 Mar 13, 2009

    I have the same problem with the Air Pump running either until the battery drains or it sometimes just switches on/off. I have had to unhook the battery to stop this while the car is not running.

    I had seen some threads that mentioned needing to change out the ECU?


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Its probally for your cruise control

Posted on Jan 05, 2009

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