P2629: O2 Sensor Pumping Current Trim Circuit/Open (Bank 2 Sensor 1)

P2629 identifies a circuit/open result in the oxygen-sensor pumping-current trim monitoring associated with Bank 2, Sensor 1. Trim here is the sensor-related monitor terminology; it is not the same thing as the scan tool’s short- or long-term fuel-trim correction.

The cited Ford gasoline summary assigns P2629 to both a wire-diagnostic group and a Bosch air-rationality monitor. It cannot universally be reduced to a physically open calibration resistor or a rule that Bank 2 is operating on a guessed calibration.

Bank 2 Sensor 1 is an identity to confirm from the engine’s cylinder/exhaust arrangement. It is not always the rear bank, a longer lead or a connector reached behind an intake. Verify the part position and matched connector before attributing the fault to recent work or buying a replacement.

Use the full manufacturer code and suffix, sensor part identity, controller type and failure records. A connector-module calibration resistor exists in the cited Bosch LSU 4.9 product, but there is no universal resistance value, pin assignment, supply relationship or disconnected-reading test that follows from this code family.

Have the sensor-related circuit and relevant functional checks performed with the specified protected equipment and connection states. Do not jumper signal/reference terminals, use an improvised load, cut a lead to search for contamination, apply a heat gun or move wiring around a running hot exhaust. A correct part and undamaged connector are checks to document, not assumptions to turn into a diagnosis.

Ask for the failed test, demonstrated repair and required verification. Fuel-system status, drivability and any mixture/catalyst concerns must be assessed on their own evidence; no universal richer/open-loop fallback or safe travel distance can be read from this code. Follow current warnings and seek assistance for misfire, severe running problems, overheating or unsafe response.