Tag: P0171 P0174 System Lean

In this video, I will be going over how to confirm you’re repair after diagnosing a p0171 or a p0174 system lean bank 1 and system Lean Bank 2. And this video will be repairing a vacuum leak and monitoring fuel trim values to verify that the repair was successful using fuel trim values on a scan tool. Just a brief overview of fuel trim used to verify a repair.

You fuel trim numbers should always stay around 0% and if they are adding fuel that would mean your engine is running lean. If your fuel trim is taking away the fuel that means your engine is running rich. #systemlean #p0171 #p0174

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