OBD-II code · Powertrain (generic)
P0056 HO2S Heater Control Circuit (Bank 2 Sensor 2)
HO2S Heater Control Circuit (Bank 2 Sensor 2): the control circuit has an electrical fault. The heater brings the oxygen sensor to operating temperature for closed-loop fuel control.
Is it safe to drive with P0056?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyHeater element open
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, Oxygen Sensor Heater, Sensor Wiring
Related codes
- P0030HO2S Heater Control Circuit (Bank 1 Sensor 1)
- P0036HO2S Heater Control Circuit (Bank 1 Sensor 2)
- P0050HO2S Heater Control Circuit (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
- P0057HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
- P0058HO2S Heater Control Circuit High (Bank 2 Sensor 2)
- P0059HO2S Heater Resistance Bank 2 Sensor 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.