P223F code meaning
O2 Sensor Reference Resistance Out Of Range (Bank 2)
Powertrain system Generic code P22xx codes Check engine light
What P223F means
P223F is the reference-cell resistance check for the front wide-band sensor of bank 2. GM's 2016 and 2018 tables translate the measured resistance into element temperature and count readings below 700 °C or above 1,000 °C; 64 of 80 samples (2018) or 128 of 160 (2016) at 25 ms set a Type B code. The monitor waits for heater warm-up plus 20 s and is blocked while the bank 2 heater codes P0050-P0052 or P0155 are present, so a pure heater fault shows up there first. A reading that is too cold despite a working heater points to a sensor whose ceramic has aged and become high-resistance; too hot suggests overheating, for example from misfire. Bosch's LSU 4.9 data sheet gives 300 ohms as the nominal cell resistance. P223E is bank 1, P223D the pump-current check of the same sensor.
P223F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P223F
- Check engine light after two drives
- Bank 2 lambda control slow to become active after a cold start
Common causes of P223F
- Most likelyBank 2 sensor ceramic aged and high-resistance
- PossibleWeak heater supply or high resistance in the heater wiring
- Less likelySensor overheated by misfire or very high exhaust temperature
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Oxygen sensor bank2 sensor1Oxygen sensor heaterECM
What each part of P223F 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). |
| 3F | The exact fault in that area. |
What to do next
- Note P223F 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 P223F
What does P223F mean?
P223F means "O2 Sensor Reference Resistance Out Of Range (Bank 2)". P223F is the reference-cell resistance check for the front wide-band sensor of bank 2. It is a generic code, so it means the same on every make.
Is it safe to drive with P223F?
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 P223F fail an emissions test?
Yes, it can. P223F 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 P223F to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P223F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.