P2252: O2 Sensor Negative Current Control Circuit Low (Bank 1 Sensor 1)
Standardized SAE J2012 code · P22xx — Fuel & air metering and auxiliary emission controls
What does P2252 mean?
The negative-current (Vs negative) line on the bank 1, sensor 1 wide-band oxygen sensor is below the lower threshold. This line is the return path for the Nernst cell; loss of the signal blocks the lambda calculation.
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 Vs negative line shorted to ground
- Medium Nernst cell return open inside sensor
- Low Connector pins corroded - high contact resistance
Likelihood is a general estimate across vehicles; your make and model may differ.
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