P2630
O2 Sensor Pumping Current Trim Circuit Low (Bank 2 Sensor 1)
- Severity
- Medium
- Driving
- Drivable — book it in
A fault in the oxygen sensor pumping current trim circuit on bank 2 - a low reading, usually a short to earth or an open circuit. Every wideband oxygen sensor is slightly different, so each is supplied with a calibration value - usually a resistor built into its own connector - that tells the module how to interpret it. This circuit reads that value, and without it the module cannot trust the sensor's readings.
Possible causes
- CommonCorroded or water-ingressed connector at the sensor
- CommonDamaged calibration resistor in the sensor connector
- CommonWrong or aftermarket sensor fitted
- CommonWiring damaged by exhaust heat or chafing
- PossibleFailed wideband oxygen sensor
- RareFailed control module input
What you might notice
- Check engine light on
- Worse fuel economy
- Failed emissions test
- Fuel trim stuck at a default value
- Rough running in some conditions
What to check, in order
- Inspect the sensor connector closely. The calibration resistor is inside it on most designs, so a damaged or corroded connector destroys the calibration even though the sensor is fine.
- Ask whether a non-original sensor was fitted. A sensor supplied without its matched connector, or a cheap substitute, sets exactly this code.
- Check the harness where it passes near the exhaust for heat and chafe damage.
- Do not cut and splice a wideband sensor connector. The calibration lives in it, and joining the wires to a different plug loses it.
- Check both banks - both faulting together points at a shared circuit rather than two failed sensors.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Computer output circuits and control module
P2600P2601P2602P2603P2604P2605P2606P2607P2608P2609P2610P2611P2612P2613P2614P2615P2616P2617P2618P2619P2620P2621P2622P2623P2624P2625P2626P2627P2628P2629P2630P2631P2632P2633P2634P2635P2636P2637P2638P2639P2640P2641P2642P2643P2644P2645P2646P2647P2648P2649P2650P2651P2652P2653P2654P2655P2656P2657P2658P2659P2660P2661P2662P2663P2664P2665P2666P2667P2668P2669P2670P2671