Help with P0327 Knock Sensor low voltage

I'm working on a friends Lumina (1999 3.1L) and the car keeps throwing a P0327 code. Any suggestions. he swapped out the knock sensor but no luck. I was hoping to check the connector to the knock sensor.

It has to pass an emmission test and keeps tripping the ses light.

Any help would be greatly appreciated.


**** Note: His Haynes manual states that there are two knock sensors!

I can only locate the one by the oil filter.


Help!!!!!!!!!!!!! :banghead:

Correct, check connector or harness for corrosion or poor contacts.