Code result
P23BB
NOx Sensor Heater Resistance Bank 1 Sensor 3
Moderate severity
What it means
The resistance of the NOx sensor heater on bank 1 sensor 3 is outside the calibrated band - aged element or contact resistance increased.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Heater element aged
highOne of the most commonly reported causes for this code — check this first.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P23BB freeNo credit card required