O2 Sensor Pumping Current Trim Circuit/Open Bank 1 Sensor 1
The ECU detects an open in the pumping current trim circuit of the wide-band oxygen sensor on bank 1 sensor 1. Without trim correction, the lambda value reported by the sensor is not accurate.
Affected components
- Oxygen sensor wideband
- Oxygen sensor trim wiring
Common causes
- High likelihood: Trim wire open
- Medium likelihood: Internal sensor fault
- 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
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.