Code result
P2BAF
NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 1
High severity
What it means
The heater sense feedback of NOx sensor 1 on bank 1 reports values that do not match expected operation. The sensor warm-up cycle does not behave as the diagnostic expects.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
NOx sensor aging
highOne of the most commonly reported causes for this code — check this first.
High resistance in heater circuit
mediumA plausible cause — test and verify before replacing parts.
Sensor element aged beyond calibration window
lowLess common, but worth ruling out after the more likely causes.
Related help
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