OBD-II code · Powertrain (generic, extended)
P22B4 O2 Sensor Negative Current Control Circuit High (Bank 1 Sensor 2)
O2 negative current line on bank 1 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 P22B4?
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)
- P22B2O2 Sensor Negative Current Control Circuit/Open (Bank 1 Sensor 2)
- P22C1O2 Sensor Negative Current Control Circuit High (Bank 2 Sensor 2)
- P22B1O2 Sensor Reference Voltage Circuit High (Bank 1 Sensor 2)
- P22B3O2 Sensor Negative Current Control Circuit Low (Bank 1 Sensor 2)
- P22B5O2 Sensor Pumping Current Trim Circuit/Open (Bank 1 Sensor 2)
- P22B6O2 Sensor Pumping Current Trim Circuit Low (Bank 1 Sensor 2)
- P22B7O2 Sensor Pumping Current Trim Circuit High (Bank 1 Sensor 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.