Faulty downstream oxygen sensor; Shorted or open wiring; Exhaust leak near the sensor; Corroded or contaminated connector.

Oxygen (lambda) sensors

P0136 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)

Q: What does P0136 mean?

O2 Sensor Circuit Malfunction (Bank 1 Sensor 2). The downstream oxygen sensor, located after the catalytic converter, is mainly used to monitor catalyst efficiency. P0136 is set when the ECU detects an implausible signal or a circuit fault from this sensor.

The downstream oxygen sensor, located after the catalytic converter, is mainly used to monitor catalyst efficiency. P0136 is set when the ECU detects an implausible signal or a circuit fault from this sensor.

Common causes

Faulty downstream oxygen sensor
Shorted or open wiring
Exhaust leak near the sensor
Corroded or contaminated connector

Typical symptoms

Check engine light (MIL) on
Catalyst monitor not completed (readiness not set)
Emissions test failure
Usually little or no change in drivability

P0136 and NuoVolta

If the catalytic converter and downstream sensor have been removed for off-road or motorsport use, where permitted by law, the NuoVolta Lambda / O2 Removal or Catalyst Removal solution adjusts the ECU calibration and the DTC removal feature can disable this code. Otherwise, test the sensor and wiring first.

Lambda / O2 Removal Available for 309 ECUs Catalyst Removal Available for 274 ECUs

Related codes

P0130O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)

Diagnose and repair real faults first. Removing or disabling emission systems is only permitted where allowed by law, for example for off-road or motorsport use.