What is OBD-II: On-Board Diagnostics (OBD-II) is a standardized system in all US cars since 1996 that monitors vehicle health and stores Diagnostic Trouble Codes (DTCs) when faults occur. Common ...

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What are lean codes: P0171 and P0174 indicate a lean fuel mixture on Bank 1 and Bank 2, often detected by upstream oxygen sensors. Why they matter: Lean conditions can cause misfires, hesitation, ...

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