O2 Sensor Pumping Current Circuit High (Bank 2 Sensor 1)
The pumping-current line of the bank 2, sensor 1 wide-band oxygen sensor reads above the upper threshold. Common with a short to a positive supply or a damaged sensor amplifier in the ECU.
Affected components
- Oxygen sensor upstream b2
- Oxygen sensor wiring
Common causes
- High likelihood: Pumping current line shorted to positive
- Medium likelihood: Sensor internally shorted
- Low likelihood: Connector pins corroded - high contact resistance
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
- A drive cycle may be required after repair
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.