Powertrain
Definition only
Lights the check engine lamp
P23A1: O2 Sensor Exhaust Sample Error Bank 2 Sensor 2
Standardized SAE J2012 code · P23xx — Ignition system and misfire
What does P23A1 mean?
O2 Sensor Exhaust Sample Error Bank 2 Sensor 2: the control module has detected this fault condition. (Code P23A1)
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 Sensing element or protective tube fouled
Likelihood is a general estimate across vehicles; your make and model may differ.
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P23A1 in the community
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