Engine and gearbox (P)
P0032: O2 Sensor Heater Circuit High Voltage
The oxygen sensor heater circuit for bank 1, sensor 1 is reporting a high voltage. This may be due to a short to the battery or an open circuit in the heater element.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- Check engine light on
- Increased fuel consumption
- Failed emissions test
- Rough idle
Common causes
- Heater wire shorted to supply voltage
- Connector pins corroded
- Supply wire pinched against battery source
How to check it yourself
- Inspect the oxygen sensor wiring for damage
- Check the connector for corrosion or loose pins
- Test the heater circuit for continuity
- Measure the voltage at the sensor connector
Can I keep driving?
The car can be driven, but it may have increased emissions and reduced fuel efficiency.
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer