Replacing Knock Sensors

Peter Schulz pcschulz at
Thu Jan 5 09:48:40 EST 2006

Happy New Year..

Need to replace a pair of knock sensors on one of the 3B wagons...

Visually, the insulation has crumbled right off the leads, so its time - 
dont have ECU codes for a bad sensor, but the car lacks power and I've 
checked or replaced the other usual suspects,

Family Album shows a blue sensor  054905377A  and a brown one 077 905 377A

The brown one cost 2x the blue there a difference or can the blue 
one be used in both the front and rear locations?



-Peter Schulz
Chelmsford Ma, USA

1991 200 20v Q Avant Titan Grey
1991 200 20v Q Avant Indigo Mica
1991 90 20v Q Red
1990 CQ silver (awaiting S2 engine transplant)
1990 CQ red ( to part or not)

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