OBD-II code · Powertrain (generic, extended)
P23C1 NOx Sensor Sensing Element Bank 1 Sensor 3
NOx Sensor Sensing Element Bank 1 Sensor 3: the control module has detected this fault condition.
Is it safe to drive with P23C1?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySensor element poisoned by silicone or sulphur
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–1.8 h
- Emissions test
- Likely to fail
- Parts involved
- Nox Sensor B1s3
Related codes
- P22FENOx Sensor Sensing Element Bank 1 Sensor 2
- P23BENOx Sensor Performance Signal Biased or Stuck Low Bank 1 Sensor 3
- P23BFNOx Sensor Performance Slow Response Low to High Bank 1 Sensor 3
- P23C0NOx Sensor Performance Slow Response High to Low Bank 1 Sensor 3
- P23C2NOx Sensor Delayed Response High to Low Bank 1 Sensor 3
- P23C3Engine Coolant Bypass Valve C Position Sensor Circuit
- P23C4Engine Coolant Bypass Valve C Position Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.