O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 3
Voltage on the wide-band oxygen sensor positive pump current line of bank 1 sensor 3 is below the expected window. Wire shorted to ground or pump cell short.
Affected components
- Oxygen sensor b1s3
- Wiring harness
- Ecm
Common causes
- High likelihood: Pump current wire shorted to ground
- Medium likelihood: Internal short in 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
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.