P2626 code meaning
O2 Sensor Pumping Current Trim Circuit/Open (Bank 1 Sensor 1)
Powertrain system Generic code P26xx codes Check engine light
What P2626 means
Wide-band lambda probes such as the Bosch LSU 4.9 carry a calibration resistor in their plug; the engine module uses it to scale the pumping current. P2626 says this trim path at the front probe of bank 1 looks open. Makers detect it differently: GM's 2023 tables let the sensor chip measure the resistor after each start and fail an LSU 4.9 above 379.5 ohms (NGK ZFAS-U2: above 4,644 ohms), type B. VW's 2014 data books flag a probe signal above 4.81 V, and the 2010 Saab 9-5 applies that limit during fuel cut-off (type B). Ford's Bosch-equipped engines run an air test in overrun and fail a pump current above 3.09 mA held for 2 s. Ford's TSB 17-2124 for the 3.5 L EcoBoost in Explorer and F-150 (2015-17) cures it with a new probe. Low and high faults are P2627/P2628; bank 2 is P2629.
P2626 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2626
- Check engine light
- Fuel control falls back to open loop on bank 1
- Slightly higher fuel consumption or rough idle
Common causes of P2626
- Most likelyFront wide-band probe defective (trim resistor, pump cell or heater damage)
- PossibleTrim line broken or pin pushed back in the six-pin probe connector
- Less likelyMoisture or corrosion in the probe connector raising the measured resistance
- Less likelyEngine software requiring an update after probe replacement (some makes)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Oxygen sensor bank1 sensor1Sensor calibration resistorOxygen sensor wiring
What each part of P2626 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| 26 | The exact fault in that area. |
What to do next
- Note P2626 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2626
What does P2626 mean?
P2626 means "O2 Sensor Pumping Current Trim Circuit/Open (Bank 1 Sensor 1)". Wide-band lambda probes such as the Bosch LSU 4.9 carry a calibration resistor in their plug; the engine module uses it to scale the pumping current. It is a generic code, so it means the same on every make.
Is it safe to drive with P2626?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2626 fail an emissions test?
Yes, it can. P2626 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2626 to fix?
Difficulty: medium. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2626 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.