OBD-II code · Powertrain (generic, extended)
P2C64 O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 3
The wide-band oxygen sensor on bank 1 sensor 3 reports a pumping current trim circuit high condition. Lambda regulation accuracy is impaired.
Is it safe to drive with P2C64?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyTrim wire shorted to B+
- PossibleOpen pump cell trim
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Oxygen Sensor B1s3, Wiring Harness, Ecm
Related codes
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Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.