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- Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17
The NOx Sensor is a emissions-control component designed to monitor nitrogen oxide (NOₓ) levels in the vehicle’s exhaust system. Installed within the exhaust stream, this sensor provides real-time data to the Engine Control Unit (ECU) to regulate combustion and after-treatment systems such as catalytic converters or SCR/AdBlue systems.
Fits
Porsche 958 Cayenne V6 3.0L Diesel 245HP 2012-18
Cars With Engine Codes:
CNRB
Diagram Ref No 17
What This Product Does:
- The NOx sensor continuously monitors levels of nitrogen oxides in your exhaust gases. This data is sent to the Engine Control Unit (ECU) or the vehicle’s emissions-control module.
- Based on NOx levels, the ECU (or emissions system) adjusts engine parameters (air-fuel ratio, exhaust after-treatment, DEF/AdBlue dosing in diesel/SCR systems, etc.) to ensure emissions stay within legal/environmental limits.
- Helps ensure compliance with environmental regulations and reduces harmful exhaust emissions — particularly NO and NO₂, which contribute to smog, acid rain, and health hazards.
- Supports proper functioning of components like catalytic converters or SCR (Selective Catalytic Reduction) systems by ensuring they receive accurate feedback for NOx removal.
Symptoms Of Failure:
- Engine warning light / emissions fault appears on the dashboard — the ECU detects abnormal or missing NOx sensor signals.
- Reduced engine performance or “limp mode” — the ECU may limit engine output, or injection logic may suffer, leading to poor acceleration or unstable performance.
- Increased fuel consumption or poor fuel economy — incorrect NOx data can cause the engine management system to mis-manage the air/fuel mixture.
- Rough idle, misfires, or jerky acceleration — combustion may become uneven if exhaust feedback is wrong, especially under load or varying throttle.
- Failed emissions or inspection test, or excessive exhaust pollution — without a working NOx sensor, the emissions-control system can’t properly regulate NOx output.
- Potential damage to exhaust-aftertreatment components (e.g. catalytic converter or SCR system) — inaccurate NOx readings can lead to improper dosing or treatment, shortening component life.
- Compliance with Emissions Regulations: For modern diesel (and many petrol) vehicles, a working NOx sensor is often required to meet compliance standards. Without it, you may fail emissions tests.
- Protects Engine Performance & Efficiency: A proper NOx sensor ensures the ECU has accurate exhaust feedback — leading to correct combustion, fuel economy, and stable power delivery.
- Prevents Further Damage: Faulty NOx readings can lead to improper exhaust after-treatment (e.g. over- or under-dosing AdBlue or mismanaging catalytic converter operation), which can damage costly components downstream.
- Environmental Responsibility: The sensor helps ensure harmful nitrogen oxides aren’t released in harmful quantities, reducing environmental harm and air-quality impact.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
958907807D
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