DTC P0131

DTC: P0131 Oxygen sensor 1 (G3/2) circuit low voltage

Activation requirement CHECK ENGINE lamp:
Two consecutive trips with fault.

Activation of CHECK ENGINE lamp:
At start of next trip.

Test to detect fault:
With the oxygen sensor hot, the frequency of the sensor output signal should be greater than 1.5 Hz. Simultaneously, at a certain load condition and engine speed, mean values are calculated for the lowest and highest voltage. The difference must be greater than approximately 650 mV.