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HOW TO FIX CODE P0172 ON MY TRAILBLAZER

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HOW TO FIX CODE P0172 ON MY TRAILBLAZER-FUEL TO RICH ?

Vehicle: 2003,CHEVROLET,TRAILBLAZER ,4.2L

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Hi there,

Most of the time this code is the result of a bad O2 sensor but it can also be caused by leaking fuel injectors or even an engine that isn't burning clean. If you need a tune up it can cause this code.

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