OBD-II code · Powertrain (generic)
P0052 HO2S Heater Control Circuit High (Bank 2 Sensor 1)
HO2S Heater Control Circuit High (Bank 2 Sensor 1): the control-circuit voltage is above the expected range. The heater brings the oxygen sensor to operating temperature for closed-loop fuel control.
Is it safe to drive with P0052?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyHeater wire shorted to supply
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–1.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Oxygen Sensor Heater, Sensor Wiring
Related codes
- P0032HO2S Heater Control Circuit High (Bank 1 Sensor 1)
- P0038HO2S Heater Control Circuit High (Bank 1 Sensor 2)
- P0058HO2S Heater Control Circuit High (Bank 2 Sensor 2)
- P004FTurbocharger/Supercharger Boost Control B Circuit Intermittent/Erratic
- P0050HO2S Heater Control Circuit (Bank 2 Sensor 1)
- P0051HO2S Heater Control Circuit Low (Bank 2 Sensor 1)
- P0053HO2S Heater Resistance Bank 1 Sensor 1
- P0054HO2S Heater Resistance Bank 1 Sensor 2
- P0055HO2S Heater Resistance Bank 1 Sensor 3
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.