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TuningBot DTC Database · v4.37.14

P225D NOx Sensor Performance - Signal Biased/Stuck Low Bank 1 Sensor 1

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

P · PowertrainEmissionsOBD2

What P225D means

P225D
NOx Sensor Performance - Signal Biased/Stuck Low Bank 1 Sensor 1 Generic · emissions Data confidence 65%

The control module registered the fault condition described as "NOx Sensor Performance - Signal Biased/Stuck Low Bank 1 Sensor 1".

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
P225AP225BP225CP225EP225F
P22 range
P2200P2201P2202P2203P2204P2205P2206P2207P2208P2209P220AP220BP220CP220DP220EP220FP2210P2211

How to read P225D

P

Powertrain: engine, transmission and driveline systems.

2

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

25D

Specific fault index within the subsystem.

Frequently asked questions about P225D

What does P225D mean?

NOx Sensor Performance - Signal Biased/Stuck Low Bank 1 Sensor 1. The control module registered the fault condition described as "NOx Sensor Performance - Signal Biased/Stuck Low Bank 1 Sensor 1".

Is P225D generic or manufacturer-specific?

P225D is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P225D at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. 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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