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TuningBot DTC Database · v4.37.15

P23AF NOx Sensor Circuit High Bank 1 Sensor 3

Generic (OBD-II) interpretation in the TuningBot DTC database.

P · PowertrainEmissionsOBD2

What P23AF means

P23AF
NOx Sensor Circuit High Bank 1 Sensor 3 Generic · emissions Data confidence 65%

The control module detected that the signal in the NOx circuit stayed above the expected operating range.

Symptoms

  • MIL or SCR/AdBlue warning illuminated
  • Possible start-count-down or torque limitation on some applications

Possible causes

  • Reductant quality or level fault
  • Dosing valve or supply module fault
  • NOx sensor fault
  • Frozen or crystallized reductant lines
  • Wiring or connector fault

Recommended checks

  • Read NOx sensor values and dosing system status
  • Check reductant level and quality data
  • Inspect dosing valve, lines and heater operation
  • Check wiring and connectors of the SCR components
  • Check for OEM technical bulletins and software updates

Related and nearby codes

Related codes
P23ABP23ACP23ADP23AE
P23 range
P2300P2301P2302P2303P2304P2305P2306P2307P2308P2309P230AP230BP230CP230DP230EP230FP2310P2311

How to read P23AF

P

Powertrain: engine, transmission and driveline systems.

2

Generic SAE-standard code: same meaning on every make.

3AF

Specific fault index within the subsystem.

Frequently asked questions about P23AF

What does P23AF mean?

NOx Sensor Circuit High Bank 1 Sensor 3. The control module detected that the signal in the NOx circuit stayed above the expected operating range.

Is P23AF generic or manufacturer-specific?

P23AF is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P23AF at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: SCR / AdBlue System

ECU tuningDyno-tested results by model and engine See the results →

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