P2BAF
NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 1
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.
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.
Common causes
- high
NOx sensor aging
One of the most commonly reported causes for this code — check this first.
Typical part cost: $440-1650
- medium
High resistance in heater circuit
A plausible cause — test and verify before replacing parts.
Typical part cost: $440-1650
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does P2BAF mean?
P2BAF means "NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 1". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.
What are the most common causes of P2BAF?
nox sensor aging; high resistance in heater circuit; sensor element aged beyond calibration window — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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