DTC Detection Logic

The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen storage capacity of the three way catalyst 1 causes the longer switching time. To judge malfunctions of heated oxygen sensor 2, ECM monitors whether the maximum voltage of the sensor is sufficiently high during various driving conditions such as fuel-cut.

Courtesy of NISSAN NORTH AMERICA, INC.

: 0.74 V

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P0137

HO2S2 (B1)

(O2 sensor circuit low voltage bank 1 sensor 2)

The maximum voltage from the sensor does not reach the specified voltage.
ECM detects the heated oxygen sensor 2 circuit is short to ground.