P0032
HO2S Heater Control Circuit High (Bank 1 Sensor 1)
O2 sensor heater control circuit on bank 1, sensor 1 reports high voltage. Likely shorted to B+ or open in the heater element itself. The heater warms the sensor element to operating temperature (~600 °C); without it the sensor stays inactive in closed loop and the ECM cannot trim mixture.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Heater wire shorted to supply voltageCommon
- Connector pins corroded - high contact resistanceLess likely
- Supply wire pinched against B+ sourceLess likely
Parts involved
- Oxygen Sensor Heater
- Sensor Wiring
P0032 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.