88 Audi 90 need sensor help
I have a 1988 Audi 90 4 cyl . Had to remove/reinstall head. I have 1 sensor left...not sure where it goes. Attached is a picture of sensor. It has 1 wire going to it. Help please
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jkjersey
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drft1
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beholder
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it checks for blurriness of the combustion. 
