Clearing Diagnostic Trouble Codes

After having displayed and recorded all codes stored in fault memory, use the following procedure to clear the fault memory.

Diagnostic Connectors - Activating Self Diagnostics:

1a. (Models produced before March 1990)
With ignition turned "off", connect jumper wire and LED test light to test connectors as when displaying fault codes (see diagram). Connect jumper wire to both diagnostic connectors and leave connected.

Diagnostic Connectors - Activating Self Diagnostics:

1b. (Models produced after March 1990)
With ignition turned "off", connect jumper wire and LED test light to test connectors as when displaying fault codes (see diagram). Connect jumper wire to both diagnostic connectors and leave connected.

2. Turn ignition "on", wait at least 4 seconds then disconnect one end of jumper wire. The first output check should now be initiated.

3. Reconnect jumper wire for at least 4 seconds then remove. Repeat this step until you have stepped through the output checks and code 0000 is displayed.

4. Once code 0000 is displayed (indicating the end of output checks), reconnect jumper wire. Wait a few minutes then remove (Audi says to wait 10 seconds, however, it has been reported that this does not always do the trick, waiting several minutes will). Permanent memory should now be cleared.

5. Re-check fault memory display to verify that memory has been cleared. If memory did not clear, try again only wait a little longer before disconnecting jumper wire in step 4 of this procedure.