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International Automotive Technicians Network
Re: GM 5.3 setting P0521
Posted to Technical Discussion Forum on 7/28/2019 3 Replies

Hi Buddy,

Every time I've seen this code, the truck either had high mileage and the engine was worn, or a new sensor fixed it. I see you have an oil filter adapter coming, you could also do something like this and run a gauge off it.

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