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Knock Knock...P0327 is here! (GM Truck)

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Pine Hollow Auto Diagnostics

This 2004 Chevy V8 truck cannot pass NYS Emissions Inspection because the Check Engine light is ON setting a persistent "P0327 Knock Sensor Bank 1" trouble code.

Both B1 and B2 sensors have been replaced, as well as the subharness under the intake manifold.
What is the root cause of this problem?

Enjoy!
Ivan

posted by hidan4e