OBD-II code · Powertrain (generic, extended)
P2627 O2 Sensor Pumping Current Trim Circuit Low Bank 1 Sensor 1
On a wide-band (broadband) O2 sensor, the trim resistor circuit that calibrates the pumping current is reading low on bank 1 sensor 1. Air-fuel feedback gain is wrong, causing rich or lean offsets.
Is it safe to drive with P2627?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyShort in the calibration trim resistor
- PossibleWater intrusion in the sensor connector
- Less likelyConnector pins corroded - high contact resistance
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
- P2630O2 Sensor Pumping Current Trim Circuit Low Bank 2 Sensor 1
- P2C63O2 Sensor Pumping Current Trim Circuit Low Bank 1 Sensor 3
- P2624Injector Control Pressure Regulator Circuit Low
- P2625Injector Control Pressure Regulator Circuit High
- P2626O2 Sensor Pumping Current Trim Circuit/Open Bank 1 Sensor 1
- P2628O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 1
- P2629O2 Sensor Pumping Current Trim Circuit / Open Bank 2 Sensor 1
- P262AFuel Injector - Pilot Injection Not Learned
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.