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SCR after-treatment · NOx

Applications

NOx sensors are part of the SCR (Selective Catalytic Reduction) control loop in diesel after-treatment. Select each sensor for the specific vehicle, system voltage and installation position.

How NOx sensors work in an SCR system

Upstream (engine-out)

Mounted before the SCR catalyst, it reports the NOx leaving the engine so the after-treatment controller can calculate how much reductant (DEF/AdBlue) to dose.

Downstream (tailpipe)

Mounted after the SCR catalyst, it measures remaining NOx so the system can monitor conversion efficiency, correct dosing and support on-board diagnostics.

Upstream and downstream sensors are often different part numbers even on the same vehicle — confirm the position from your OE number.

Commercial vehicles

NOXIA offers NOx sensor references for commercial-vehicle and engine applications including Volvo, Scania, MAN, DAF, IVECO, Mercedes-Benz, Cummins, Hino, FUSO and Isuzu. Match the OE number and system voltage for each application.

Browse 24V references (109)

Passenger cars & light vehicles

Explore 12V NOx sensor references for BMW and Mercedes-Benz passenger-car and light-vehicle systems, as well as selected commercial-vehicle applications. Confirm the exact replacement by OE number.

Browse 12V references (118)

Off-highway

BG supports NOx sensor applications for on- and off-highway equipment. Send the equipment details, OE number and sensor label for application matching with NOXIA.

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Application-specific matching

  1. 01Start from the OE number on the existing sensor label or the vehicle parts catalogue.
  2. 02Confirm the sensor supply voltage: 12V or 24V.
  3. 03Confirm the Continental-type number where available (5WK9 …).
  4. 04Match probe, harness connector, mounting position and software requirements — we verify these with you before quoting.

Vehicle brand names, OE numbers and Continental-type part numbers are used for reference and identification only. NOXIA is an independent aftermarket manufacturer and is not affiliated with, authorised by or endorsed by any vehicle or original-equipment manufacturer. Fitment must be confirmed against your OE number before ordering.