This means that it has the same meaning for the Chevy Blazer as it would any other vehicle. It is letting you know that there is an issue with the secondary air injection system. The secondary air injection system injects air into the exhaust to help lower emissions. Most of the time, P is going to be caused by a failure in this pump or the one way check valve. But there can be other reasons the code is thrown as well.

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My Check engine Light comes on with a P Code. It used to come on every 6 months and I would get it cleared. Can someone help me. That code usually occurs when the one-way check valves deteriorate where it allows moisture from the combustion process to enter the air pump.

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