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Q: fuel sensor on 2002 Buick Rendezvous

My check engine light came on. I took it and had it put on the machine to see why. The code that show was P0327. Knock sensor condition. Probable cause Knock sensor defective-Check connector and wiring to sensor - engine mechanical condition- knock or rattle in engine - low fuel pressure. How serious is this problem going to turn into? Where the best place to have this check out?
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