P0171System Too Lean (Bank 1)

The engine computer detected that the air-fuel mixture on bank 1 is too lean, meaning there is too much air or not enough fuel. The computer added extra fuel to compensate but reached its limit. A lean mixture is commonly caused by unmetered air entering the engine or by weak fuel delivery.

Ամենատարածված պատճառներն են՝ Vacuum or intake air leak (most common), Dirty or faulty mass air flow (MAF) sensor, Weak fuel pump or clogged fuel filter (low fuel pressure), Dirty or clogged fuel injectors, Failing oxygen sensor, Leaking PCV system or intake gasket։

Սովորաբար անվտանգ է կարճ տարածությունների վրա վարել, սակայն շուտով ստուգել տվեք։

Have the car checked for vacuum and intake leaks first, since unmetered air is the most frequent cause, and have the MAF sensor inspected or cleaned. If no leaks are found, a professional should test fuel pressure and injector delivery; a persistent lean condition can cause misfires and engine damage over time, so fix it soon.