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.
Affected components
- Oxygen sensor
Common causes
- High likelihood: Short between signal and heater wires
Possible symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.