P22C3 code meaning
O2 Sensor Pumping Current Trim Circuit Low (Bank 2 Sensor 2)
Powertrain system Generic code P22xx codes Check engine light
What P22C3 means
P22C3 is the low fault on the trim (label resistor) circuit of the bank 2 post-catalyst wide-band probe. Ford's 2012 OBD summary shows how makers can read this for NTK probes: at each key-on the controller switches the heater off, samples a voltage divider and estimates the label resistor; a value too high is taken as a broken or grounded lead and sets the trim-low code (P2630 for the bank 2 front probe). The controller then falls back to the resistor rank stored in memory, so the reading stays usable but less exact. No maker documents P22C3 publicly, and GM reuses the bank 1 slot P22B6 for a NOx sensor oxygen check without a bank 2 equivalent. P22C2 is the open, P22C4 the high variant. The lamp lights.
P22C3 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P22C3
- Check engine light
- Code typically appears right after engine start
Common causes of P22C3
- Most likelyTrim wire chafed and shorted to ground
- PossibleHigh-resistance or corroded trim terminal raising the measured resistance
- PossibleDefective label resistor in the sensor connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Oxygen sensor bank2 sensor2Oxygen sensor wiringECM
What each part of P22C3 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| C3 | The exact fault in that area. |
What to do next
- Note P22C3 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P22C3
What does P22C3 mean?
P22C3 means "O2 Sensor Pumping Current Trim Circuit Low (Bank 2 Sensor 2)". P22C3 is the low fault on the trim (label resistor) circuit of the bank 2 post-catalyst wide-band probe. It is a generic code, so it means the same on every make.
Is it safe to drive with P22C3?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P22C3 fail an emissions test?
Yes, it can. P22C3 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P22C3 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P22C3 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.