P22BD: O2 Sensor Reference Voltage Circuit Low (Bank 2 Sensor 2)
Standardized SAE J2012 code · P22xx — Fuel & air metering and auxiliary emission controls
What does P22BD mean?
O2 reference voltage on bank 2 sensor 2 below lower plausibility — short to ground. A drifted or sluggish lambda sensor lets the mixture run lean or rich without correction — fuel economy and emissions suffer immediately.
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 Short to ground
- Low Connector pins corroded - high contact resistance
- Low Harness chafing through insulation
Likelihood is a general estimate across vehicles; your make and model may differ.
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P22BD in the community
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