P2629
ModerateP2629 — Oxygen Sensor Pump Current Calibration Range/Performance
Description
What P2629 Means
P2629 is a universal OBD-II code that points to a problem with the oxygen sensor pump current calibration. It matches BMW code 274B and belongs to the fuel-air mixture control system.
The oxygen sensor (lambda sensor) with pump current (wideband sensor) uses a controlled current to hold a reference voltage in the measuring cell. The engine control unit (DME) periodically calibrates this current to compensate for sensor aging and outside conditions. P2629 sets when the DME sees the calibration fall outside the allowed range or fail to complete correctly.
Affected components: the oxygen sensor (wideband), its electrical circuit and connector, and the DME software that handles the calibration.
Symptoms
Symptoms
- Check Engine light: comes on in the instrument cluster.
- Higher fuel consumption: from incorrect mixture measurement.
- Increased emissions: possible deviation from emissions standards.
Causes and fixes
Diagnosis and Repair
- Check the oxygen sensor wiring: inspect the harness and connector for damage, corrosion, and a solid contact.
- Replace the oxygen sensor: if the wiring is good but the code returns, fit a new sensor.