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Re: Post cat fuel trim lean
Posted to Technical Discussion Forum on 2/11/2020 1 Reply

Does your scanner display Fuel trim per O2 sensor? If it does (Not all cars do, and some only do fronts or only rears, some do all 4). If you have both showing lean when it happens, you had a lean condition. If the fronts show perfectly normal per sensor trims... Login to read more.

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