OBD-II trouble code
P2626: O2 Sensor Pumping Current Trim Circuit/Open (Bank 1 Sensor 1)
Application matters: Bank 1 Sensor 1 identifies the monitored position. Supplier construction examples and the Ford NTK/Bosch monitor examples must not be generalized into universal wiring or fallback rules.
P2626 concerns the Bank 1 Sensor 1 pumping-current trim monitor. It does not prove that every vehicle has lost a connector resistor or entered a particular fuel-control fallback.
Quick facts
- System
- Powertrain
- Category
- Oxygen Sensor
- Severity
- Medium severity
- Driving guidance
- Depends on symptoms and vehicle guidance
- Repair cost range
- Get a vehicle-specific estimate after diagnosis.
- DIY difficulty
- Shop recommended
A code alone cannot establish whether driving is safe. Stop safely for a red brake or oil-pressure warning, overheating, severe misfire, stalling, or impaired braking or steering, and follow the owner's manual. Restraints faults can reduce crash protection even when the vehicle runs normally.
Part of a family with 6 codes
P2626 is one of 6 codes covering oxygen sensor 1 pumping-current trim faults. The identifier must be matched to the exact vehicle. Related codes can share a diagnostic approach, but their circuit, failure condition, and required tests can differ.
Read the full guide for this family →Browse every code in Powertrain, or start from the full code library.
What does P2626 mean?
P2626 identifies a circuit/open result in the oxygen-sensor pumping-current trim monitoring associated with Bank 1, 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 covered Ford gasoline summary uses P2626 in an ASIC wire-diagnostic group and also in a Bosch air-rationality check under fuel-cut conditions. A physical open in a resistor lead is therefore not a universal explanation for this label. Identify which monitor actually set the report.
Bosch’s LSU 4.9 is a real example with a connector-module trimming resistor, but that component fact does not establish every sensor’s construction or prove a recently replaced sensor is wrong. Check the actual part, connector and controller requirements rather than condemning all universal or lower-cost sensors from the name.
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.
Possible causes
- A demonstrated fault in the identified Bank 1 Sensor 1 trim/signal connection or circuit
- A sensor or part/calibration mismatch confirmed against the actual system requirements
- A receiving-control or relevant functional concern established by the matched monitor diagnosis
Symptoms
- An engine or emissions warning with P2626
- Sensor/trim-monitor data requiring interpretation for the installed system
- Running, fuel-use or related emissions concerns where present rather than a promised fallback
Diagnostic steps
Save the full scan report, code status, and available freeze-frame data before clearing anything. Confirm the reporting module, any failure-type suffix, and the procedure for the exact vehicle. The steps below are an overview; use manufacturer specifications and safety procedures for testing.
- 1.Save the full P2626 report, suffix, failure records and recent sensor/exhaust work.
- 2.Confirm the actual Bank 1 Sensor 1 part, sensor technology and monitor which set the result.
- 3.Have the specified protected circuit and functional checks separate the possible causes.
- 4.Verify the demonstrated repair and assess any remaining mixture or catalyst results by their own procedures.
Repair cost
Get a vehicle-specific estimate after diagnosis.
A trouble code alone does not price the repair. Ask the shop to identify the confirmed fault and itemize diagnosis, parts, labor, programming or calibration, and taxes.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with diagnosis of the reported engine or emissions concern preselected. Adjust labor rate and vehicle category to fit your situation.
Related repairs
These links are planning examples; the code does not confirm that any listed part has failed.
DIY vs shop
A qualified shop is recommended because this can involve manufacturer-grade tooling, training, or certification that most home setups do not have. Ask the technician what testing confirmed the repair.