Intake Air O2 Sensor Pumping Current Circuit High Bank 2
The pumping current of the intake air oxygen sensor on bank 2 reports a circuit high condition. Wide-band lambda regulation on the intake side is impaired.
Affected components
- Intake air o2 sensor b2
- Wiring harness
- Ecm
Common causes
- High likelihood: Pump current wire shorted to B+
- Medium likelihood: Open pump cell
- 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.