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Always consult a professional for electrical diagnostics, as NOx sensors are expensive components, often costing hundreds of pounds. Nissan Diagnostic Codes Explained | Conyers Nissan Service
This code is an manufacturer-specific diagnostic trouble code (DTC) that indicates . The NOx sensors monitor the level of nitrogen oxide in the exhaust to manage emissions and ensure the Selective Catalytic Reduction (SCR) system is functioning correctly. Common Symptoms
: You may feel a "stumble" or hesitation during acceleration.
For reliable replacement parts, you can check retailers like eEuroparts.com or AutoZone , though you should verify the exact part number against your specific engine VIN.
Nissan uses a or Intake Manifold Runner Control (IMRC) to manage airflow into the cylinders. By narrowing the intake passage at low speeds, the engine creates "tumble" or turbulence in the air-fuel mixture, which improves combustion efficiency and reduces emissions. When the ECM detects that the valve position sensor doesn't match the commanded position, it triggers P155B. Common Symptoms Check Engine Light : The most immediate sign.
If the sensor itself is confirmed to be faulty, replacement is the most effective remedy.
In some instances, the internal circuit driver within the computer fails to ground properly, requiring a module update or replacement.