When the engine’s computer throws a P0171 code, this OBD-II refers to the oxygen level in the exhaust. Specifically, it is the “System Too Lean” code, referring to Bank 1 (the side of the engine exhausting from cylinder 1 on a V). It’s triggered by the first O2 sensor, which will read too much oxygen in the air:fuel leaving the cylinders into the exhaust. The code basically means there is too much air in the system.
Read about it on 10w40.com.
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