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2003 chevy tahoe 4.8 p0327 code for knock sensor?
replaced both knock sensors and harness, confirmed hz of about 22,500 hz reading from both sensors when block is tapped with a ball peen hammer. cleared code and drove vehicle 5 hours check engine light came on with same trouble code set in memory. note, this all started when i changed the spark plugs with O.E. A/C iridum plugs, Was told that the O2 sensor could also cause this problem. any input would be appreciated. O2 response is sluggish when monitored with live data scanner.
2 Answers
- HumveetechLv 78 years agoFavorite Answer
Never really saaw any oxygen sensors set off the knock sensor code. Disconnect the wire harness to the knock sensors. Measure both for 97-107k ohms. Could be those plugs, what type of knock sensors did you use??? Were they GM parts? I have never had any issues with the GM knock sensors when I replaced them for that code.
P0327 is for the front KS & P0332 is for the rear KS. So if your getting a P0327 only, something is wrong with that front sensor. You could swap the 2 sensors, but leave the connectors in original place & see if you get a P0327 or a P0332. If you get a P0332, then it is the KS. May have damaged it when tightening it, dont need to be that tight. If you get a P0327 still, ohm out the wires to the sensor, if good. Look elsewhere but I doubt it would the oxygen sensor. Maybe look at those plugs.
