7 Causes of a Toyota P0171 Code: "System Too Lean Bank 1"
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7 Causes of a Toyota P0171 Code: "System Too Lean Bank 1"
Causes and fixes for a Toyota P0171 Code: "Fuel Trim System Too Lean Bank 1". Triggered by the first exhaust oxygen sensor (upstream) on the "Bank 1" side of the engine. Problematic code since it can be caused by several things. Possible Causes of a Toyota P0171 Code: Failing Mass Air Flow Sensor Clogged Fuel Filter Bad Fuel Pressure Regulator ...
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