O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 3
The control circuit for the wide-band oxygen sensor negative current pump on bank 1 sensor 3 is open. Pumping current cannot be applied for lambda regulation.
Affected components
- Oxygen sensor b1s3
- Wiring harness
- Ecm
Common causes
- High likelihood: Open in pump current wire
- Medium likelihood: Internal open in pump cell
- Low likelihood: Pin pushed back out of connector body
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.