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code p0300
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  1. Chevy Silverado Forum (GMC Sierra)
    Working on 2001 GMC Sierra 2500hd with 6.0 gas engine and 351k miles. It’s throwing a p0200 and p0300 codes and showing open loop on banks 1 and 2. I’ve replaced the injectors, injector plugs, catalytic converters, o2 sensors, tested the injectors with node light, and tested MAS. Truck has no...
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