OBD-II code · Powertrain (generic, extended)
P2236 O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 2 Sensor 3)
The O2 sensor signal wire on bank 2 sensor 3 has shorted to the heater wire. This pulls the signal away from a measurement of exhaust composition and produces erratic fuel-trim behaviour.
Is it safe to drive with P2236?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyShort between signal and heater wires
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Oxygen Sensor
Related codes
- P2232O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 1 Sensor 2)
- P2233O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 1 Sensor 3)
- P2234O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 2 Sensor 1)
- P2235O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 2 Sensor 2)
- P2237O2 Sensor Pumping Current Circuit (Bank 1 Sensor 1)
- P2238O2 Sensor Pumping Current Circuit Low (Bank 1 Sensor 1)
- P2239O2 Sensor Pumping Current Circuit High (Bank 1 Sensor 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.