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Error 2142 from ECU...

In message <34FB3CE6.80BF8E30@poboxes.com> Gerard writes:

> I'd appreciate any help on how to test the knock sensor and its wiring.

Pull the connector in the engine bay and check the connections from the ECU.  
Unbolt the knock sensor, clean behind it and rebolt it.  Try again.  There 
are no tests for the knock sensor - it's a "replace if in doubt" part.

> What else could cause the ECU to indicate a 2142?

Only bad wiring.

 Phil Payne
 UK Audi [ur-]quattro Owners Club