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5kQ: Code 2142 ...

Well, as if I didn't have enough stuff to do with the Audis ... I 
was driving the '88 5kCSQW [w/QLCC] and in 3rd gear at 
about 45MPH if I give the car moderate throttle the engine 
light comes on.  I got home and checked the error code ... 
it says 2142.  From the CIS-E III section in the Bentley it 
says this means knock sensor or wiring bad.  Has anyone 
had to deal with this one?  Is it usually just wiring, or am I 
in for a new knock sensor?  If that is the case, where is the 
best place to get one?  

Steve Buchholz
San Jose, CA (USA)