Question about 1999 Audi A4

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Audi 1999 a4 1.8 turbo

My engine worked great until the batery was disconnected it seems that the ecm lost all memory and doesnt work
door open signal with blinking lights while driving drained the battery so i wanted to change it but caused the memory loss
what do i need to do

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  • james815 Jan 13, 2009

    I have a '99 A4 with a 1.8 turbo. Yesterday morning the battery was completely dead, not even a dome light would light. A friend who used to be a mechanic somehow tested the battery and said that there was a short in one of the cells. After replacing the battetry, the car will start then die within a few seconds. I understand that there is a procedure for letting the computer relearn what it needs by turning the key on without starting the vehicle then waiting for a while, however, I am not sure how long it needs to be left in this state. Could someone help me with that and let me know if there is anything else that will need to be reset.



    Any help will be appreciated.

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First thing is to disconnect the battery again, wait a minute or two, then hook it back up. Put the key in the ignition, turn it to full electrical power, but don't start it. If you have the hood open, you may hear a humming from the engine - this is the throttle body being aligned by the computer. This will help with driveability. You may need up to a week for the car to fully sort itself out though - it seems to vary widely from car to car.

Don't forget to reprogram your one-touch windows too. For each one that has one-touch down, hold the button down until the window goes fully down, then release the button and quickly press and release it again. Then hold the button until it goes all the way up, release, press up and release again. This reprograms the one-touch up feature.

Posted on Oct 25, 2008

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