NOx Sensor. Porsche 958 Cayenne 3.0L Diesel 2014-18

NOx Sensor.
The NOx Sensor is a nitrogen oxide sensor designed to measure NOx levels in the exhaust system of modern Porsche vehicles. Mounted directly in the exhaust flow, this sensor provides the Engine Control Unit (ECU) with real-time nitrogen-oxide concentration data, allowing the emissions-control system to accurately regulate combustion and after-treatment.

Fits:

• Porsche 958 Cayenne V6 3.0L Diesel 245HP 2012-18

Cars With Engine Codes:
CVVA / CVVB / CVVC

Diagram Ref No 17

What This Product Does:

• Monitors NOₓ emissions — it continuously measures nitrogen-oxide levels in the exhaust gas and communicates that data to the vehicle’s control unit (ECU).
• Enables emissions control systems — in diesel engines (or gasoline engines with NOₓ after-treatment), the sensor provides feedback for systems such as Selective Catalytic Reduction (SCR) or Exhaust Gas Recirculation (EGR), to reduce NOₓ output before gas exits the tailpipe.
  
• Helps regulate combustion and fuel dosing — by providing real-time exhaust composition data, the ECU can adjust parameters such as fuel injection timing, air/fuel ratio or SCR dosing (e.g. AdBlue injection) to optimise performance and emissions compliance.
  
• Ensures emissions compliance — given tightening environmental laws and standards (e.g. Euro 6 in Europe), a functioning NOx sensor is essential to keep NOₓ emissions within legal limits.
  
  

Symptoms Of Failure:

• “Check Engine” or emissions-system warning light appears on the dashboard.
  
• Reduced engine performance or the vehicle entering “limp mode” — some ECUs restrict engine output when exhaust-sensor data is invalid.
  
• Increased fuel consumption or poor fuel economy — incorrect NOₓ data can lead the ECU to mismanage combustion parameters.
  
• Rough idle, hesitation or unstable engine behaviour, especially under acceleration or load — as exhaust-gas composition readings become unreliable.
  
• Failed emissions test or legal compliance check — the car may fail inspection if NOₓ emissions exceed permitted levels due to faulty sensing/control.
  
• R / AdBlue warnings (on diesel/SCR systems) — because the ECU can’t reliably monitor NOₓ output.
  
  

Why Replacement Matters:

• Maintains emissions compliance — ensures that NOₓ output remains within legal limits under environmental regulations.
  
• Preserves engine performance & efficiency — accurate NOₓ feedback enables proper combustion control, fuel efficiency, and normal throttle response.
  
• Protects exhaust after-treatment hardware — catalytic converters, SCR catalysts, and associated systems depend on accurate NOₓ sensing; a faulty sensor can lead to improper dosing or damage.
  
• Avoids costly repairs or legal penalties — driving with a failed NOx sensor may lead to emissions-test failure or more extensive emissions-system damage.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

PAB907807G

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