OBD-II code · Powertrain (generic, extended)
P23A1 O2 Sensor Exhaust Sample Error Bank 2 Sensor 2
O2 Sensor Exhaust Sample Error Bank 2 Sensor 2: the control module has detected this fault condition. (Code P23A1)
Is it safe to drive with P23A1?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySensing element or protective tube fouled
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Oxygen Sensor B2s2
Related codes
- P237AO2 Sensor Exhaust Sample Error Bank 1 Sensor 2
- P237BO2 Sensor Exhaust Sample Error Bank 2 Sensor 2
- P23A0O2 Sensor Exhaust Sample Error Bank 1 Sensor 2
- P2414O2 Sensor Exhaust Sample Error Bank 1 Sensor 1
- P239EO2 Sensor Out of Range During Deceleration Bank 1 Sensor 2
- P239FO2 Sensor Out of Range During Deceleration Bank 2 Sensor 2
- P23A2Exhaust Heat Exchanger Bypass Valve B Control Circuit Open
- P23A3Exhaust Heat Exchanger Bypass Valve B Control Circuit Low
- P23A4Exhaust Heat Exchanger Bypass Valve B Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.