Diagnostic Aids
WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0326 indicates excessive engine noise and not excessive spark knock. This code does not indicate a problem in the knock sensor circuit subsystem.
Normal knock sensor values should vary between 0.2 and 2.0 volts at idle to wide open throttle shown as KS NOISE on scan tool. The voltage should increase with RPM.
Knock sensor resistance should be infinite (open).
Check knock sensor attachment bolt for tightness. Tighten to 19 ft. lbs (25 N.m)
Possible causes for engine noise:
- Valve train.
- Belt tensioner.
- Bracket loose.
- Low octane fuel in high altitude with engine under high load.