Code result
P23BD
NOx Sensor Performance Signal Biased or Stuck High Bank 1 Sensor 3
Moderate severity
What it means
The NOx sensor on bank 1 sensor 3 reports a value that stays at the upper end of its range despite changing engine conditions - sensor element biased or stuck high.
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
Sensor element biased high
highOne of the most commonly reported causes for this code — check this first.
Sensor element aged beyond calibration window
lowLess common, but worth ruling out after the more likely causes.
Sensor element contaminated by oil, soot or coolant
lowLess common, but worth ruling out after the more likely causes.
Related help
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