DTC P0031 Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1); DTC P0032 Oxygen (A/F) Sensor Heater Control Circuit High (Bank 1 Sensor 1): Description
WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.
Refer to DTC P2195 .
HINT:
- Although the DTC titles say the oxygen sensor, these DTCs relate to the Air-Fuel Ratio (A/F) sensor.
- Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and located near the engine assembly.
- When either of these DTCs are set, the ECM enters fail-safe mode. The ECM turns off the A/F sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned to OFF.
- The ECM provides a pulse width modulated control circuit to adjust the current through the heater. The A/F sensor heater circuit uses a relay on the B+ side of the circuit.
DTC DETECTION CONDITIONS CHART
| DTC No. | DTC Detection Conditions | Trouble Areas |
|---|---|---|
| P0031 | Air-Fuel Ratio (A/F) sensor heater current less than 0.8 A (1 trip detection logic) |
|
| P0032 | Air-Fuel Ratio (A/F) sensor heater current more than 10 A (1 trip detection logic) |
|