P2628

O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 1

Q: Is it safe to drive with P2628?

Short-term yes — the car won't strand you. But the air/fuel sensor helps meter fuel, so leaving it can hurt fuel economy and emissions. Fix it before an emissions test.

Q: Can I just clear P2628?

It returns within a few drive cycles unless the sensor or its wiring is repaired. If it followed a recent sensor job, check for swapped connectors first.

Fuel & air metering Generic OBD-II Medium

What it means

P2628 means the engine computer sees high voltage in the pumping-current trim circuit of the upstream wideband oxygen (air/fuel ratio) sensor on bank 1, sensor 1. This sensor helps meter fuel precisely, so a fault usually shows up as slightly worse fuel economy, emissions, and a check-engine light — not a drivability emergency.

Medium

Can I keep driving? Safe to drive short-term — the engine may run slightly rich or lean with worse fuel economy; there's no risk of a no-start.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Slightly rough idle or hesitation
Reduced fuel economy
May fail an emissions test

Common causes

Most likely first

Faulty upstream wideband (air/fuel ratio) sensor, bank 1 sensor 1Likely
Open or shorted sensor wiring or connectorCommon
Swapped or wrong sensor connectors from a previous repairCommon
Corroded connector or poor sensor groundLess often
Faulty ECM/ECU (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame; confirm bank 1 sensor 1 and check for recent sensor swaps in the vehicle history.
Inspect the sensor connector and wiring for damage, corrosion, or a wrong connection.
Check the sensor heater and signal circuits against spec.
Replace the air/fuel ratio sensor if it reads out of range.
Clear and drive a few cycles to confirm the fix.

FAQ

Quick answers

Is it safe to drive with P2628?+

Short-term yes — the car won't strand you. But the air/fuel sensor helps meter fuel, so leaving it can hurt fuel economy and emissions. Fix it before an emissions test.

Can I just clear P2628?+

It returns within a few drive cycles unless the sensor or its wiring is repaired. If it followed a recent sensor job, check for swapped connectors first.

Read & clear P2628 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX