OBD-II code · Powertrain (generic, extended)
P23B6 NOx Sensor Supply Voltage Circuit Bank 1 Sensor 3
The supply voltage to the bank 1 sensor 3 NOx sensor is outside the calibrated window.
Is it safe to drive with P23B6?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySupply voltage low
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
- 1–2 h
- Emissions test
- Likely to fail
- Parts involved
- Nox Sensor B1s3
Related codes
- P23B3NOx Sensor Heater Control Circuit High Bank 1 Sensor 3
- P23B4NOx Sensor Heater Sense Circuit Bank 1 Sensor 3
- P23B5NOx Sensor Heater Sense Circuit Range or Performance Bank 1 Sensor 3
- P23B7NOx Sensor Heater Control Circuit Range or Performance Bank 1 Sensor 3
- P23B8NOx Sensor Heater Sense Circuit Low Bank 1 Sensor 3
- P23B9NOx Sensor Heater Sense Circuit High Bank 1 Sensor 3
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.