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International Automotive Technicians Network
Re: GM 5.3 setting P0521
Posted to Technical Discussion Forum on 7/28/2019 1 Reply

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Not sure, I'm thinking 15 psi.

Customer had a laundry list, one of them was the engine light. OP sensor always read max 125 psi. After I did the work, including replace the OP sensor, I was riding ... Login to read more.

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