OBD-II code · Powertrain (generic, extended)
P22C1 O2 Sensor Negative Current Control Circuit High (Bank 2 Sensor 2)
O2 negative current line on bank 2 sensor 2 stuck high — short to B+. A drifted or sluggish lambda sensor lets the mixture run lean or rich without correction — fuel economy and emissions suffer immediately.
Is it safe to drive with P22C1?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyShort to B+
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Oxygen Sensor
Related codes
- P2253O2 Sensor Negative Current Control Circuit High (Bank 1 Sensor 1)
- P2255O2 Sensor Negative Current Control Circuit High (Bank 2 Sensor 1)
- P22B4O2 Sensor Negative Current Control Circuit High (Bank 1 Sensor 2)
- P22BEO2 Sensor Reference Voltage Circuit High (Bank 2 Sensor 2)
- P22BFO2 Sensor Negative Current Control Circuit/Open (Bank 2 Sensor 2)
- P22C0O2 Sensor Negative Current Control Circuit Low (Bank 2 Sensor 2)
- P22C2O2 Sensor Pumping Current Trim Circuit/Open (Bank 2 Sensor 2)
- P22C3O2 Sensor Pumping Current Trim Circuit Low (Bank 2 Sensor 2)
- P22C4O2 Sensor Pumping Current Trim Circuit High (Bank 2 Sensor 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.