OBD-II code · Powertrain (generic, extended)
P2628 O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 1
The wide-band trim resistor circuit on bank 1 sensor 1 reads high. Air-fuel feedback gain is wrong, causing offsets that the controller cannot compensate.
Is it safe to drive with P2628?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen calibration trim resistor
- PossibleCorroded sensor connector
- Less likelySupply wire pinched against B+ source
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Oxygen Sensor Wideband B1s1, Sensor Calibration Resistor, Wiring Harness
Related codes
- P2631O2 Sensor Pumping Current Trim Circuit High Bank 2 Sensor 1
- P2C64O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 3
- P2625Injector Control Pressure Regulator Circuit High
- P2626O2 Sensor Pumping Current Trim Circuit/Open Bank 1 Sensor 1
- P2627O2 Sensor Pumping Current Trim Circuit Low Bank 1 Sensor 1
- P2629O2 Sensor Pumping Current Trim Circuit / Open Bank 2 Sensor 1
- P262AFuel Injector - Pilot Injection Not Learned
- P262BControl Module Power Off Timer Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.