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sierra knock sensor


buckmaster1995

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I have a 2001 sierra 2500hd and awhile back my service engine light came on and it was a bad knock sensor so I changed it. Light stayed on. So I took it back apart and changed the other knock sensor and the wiring harness, so it has both new knock sensors and a new harness. And now the light goes off and on. The code is PO332 which is low input of something like that. Any ideas on what my problem could be? This truck is starting to get very expensive and time consuming.

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