Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / 28
Possible causes
- Open calibration trim resistor high
- Corroded sensor connector medium
- Supply wire pinched against B+ source low
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 150–600 €
- Estimated time: 0.5–2 h
- Component: oxygen sensor wideband b1s1
- Component: sensor calibration resistor
- Component: wiring harness
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012