P0131O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)

The upstream oxygen sensor on bank 1 is reporting a steady low voltage, which the computer reads as a constantly lean exhaust (too much oxygen) or a circuit problem. This sensor helps balance the fuel mixture, so a stuck-low signal can make the computer add extra fuel to compensate. The cause can be the sensor itself, its wiring, or an actual lean condition.

Ամենատարածված պատճառներն են՝ Failed upstream oxygen sensor, Exhaust leak before the sensor letting in fresh air, Short to ground or open in the sensor signal wire, Corroded or loose sensor connector, Genuine lean condition (vacuum leak, low fuel pressure), Engine control module fault (rare)։

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

It is usually safe to drive short distances. Have the O2 sensor wiring and an exhaust leak check done, and rule out vacuum leaks or low fuel pressure before replacing the sensor. Replacing the upstream sensor often clears it if the wiring is good.