P223E: O2 Sensor Reference Resistance Out Of Range (Bank 1)
Standardized SAE J2012 code · P22xx — Fuel & air metering and auxiliary emission controls
What does P223E mean?
The reference resistance of the wide-band O2 sensor on bank 1 is outside the calibrated range — used by the controller to set the operating point of the pumping cell. Drift here indicates sensor element ageing or contamination.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Common causes
- High Sensor element aged or contaminated
Likelihood is a general estimate across vehicles; your make and model may differ.
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