Front & Rear NOx Sensors 9816276480 – Citroën, Peugeot, Fiat, Opel & More

Ensure your diesel vehicle’s emissions‑control system works correctly with our Front & Rear NOx Sensor (9816276480) — an OEM‑spec, dual‑sensor set compatible with many Citroën, Peugeot, Fiat and Opel‑group engines. These high‑precision sensors continuously monitor nitrogen‑oxide (NOx) concentrations in the exhaust stream, feeding accurate data to the ECU/SCR system so it can adjust emissions‑related parameters (fuel/AdBlue dosing, exhaust gas recirculation, etc.) in real time. If your old sensors are degraded, soot‑clogged, or failing, replacing them with this pair from DDP Autoparts helps restore reliable NOx measurement, prevent emission faults, and ensures compliance with emissions regulations while maintaining engine performance.

OEM Number: 09811207180, 03554047, SU001-A7790, 09816276480, 03647875, 9816276480, 3647875, 9811207180, 3554047

Quantity: Pair

Our SKU: TC9816276480-9811207180PAIR_94

All our FRONT & REAR NOX SENSORS are OEM quality and reliable after-market car parts. This Front & Rear Nox Sensors is specifically compatible with Citroën: Berlingo, C-Elysee, C3, C3 Aircross, C4, C4 Cactus, C4 Spacetourer, C4 X, C5 Aircross, Dispatch, Grand C4 Spacetourer, Jumpy Bus (V_), Spacetourer Bus (V_), DS: DS 3 / DS 3 Crossback, DS 7, DS4, Fiat: Scudo, Opel: Astra, Combo, Corsa, Crossland X / Crossland, Grandland / Grandland X, Mokka, Vivaro, Zafira Life, Peugeot: 2008, 208, 3008, 301, 308, 308 SW, 5008, 508, 508 SW, Expert, Partner, Rifter, Traveller, Toyota: ProAce, Proace City, Proace City Verso, Proace Verso, Vauxhall: Astra, Combo, Corsa, Crossland X / Crossland, Grandland X / Grandland, Mokka, Vivaro, Vivaro Life.

Please use our make-model-year tool to check this part's compatibility with your vehicle. However, please note that our tool is for reference only and we recommend that you check the part number on your old unit prior to purchasing.

If you are still not sure about the compatibility of this part to your vehicle, please supply us with the VIN number or Reg number in our live chat or contact form! You can also find details on our purchasing & shipping guide here.

❓ Frequently Asked Questions (FAQ)

Q: What does a NOx sensor do?
A: A NOx sensor measures the concentration of nitrogen oxides (NO and NO₂) in the exhaust gases. It transmits this information to the vehicle’s control unit, which uses it to regulate emissions‑control systems such as the SCR/AdBlue system to keep NOx emissions within legal limits.

Q: Why are there two sensors (front & rear)?
A: Many modern diesel vehicles use more than one NOx sensor — typically one upstream (before the catalytic converter / SCR unit) and one downstream (after it). The upstream sensor measures raw exhaust NOx output; the downstream sensor verifies how effective the emissions‑control system has been at reducing NOx before release. This dual‑sensor setup ensures accurate monitoring and compliance.

Q: Which vehicles is part 9816276480 compatible with?
A: This sensor set is listed for a wide range of Citroën, Peugeot, Fiat and Opel‑group models (including vans, cars and commercial vehicles) — but compatibility always depends on engine type and exhaust‑aftertreatment configuration. Always double‑check your vehicle’s VIN / engine code and existing sensor part number before ordering.

Q: What are common symptoms of a failing NOx sensor?
A: Typical signs include:

• Emissions‑system / “NOx / AdBlue / SCR” warning lights on the dashboard

• Frequent fault codes related to NOx sensor performance or heater circuits

• Failed emissions or MOT tests (due to incorrect NOx readings)

• Increased fuel or AdBlue consumption (if the ECU tries to compensate for bad NOx data)

• Engine entering limp mode or reduced performance under certain conditions

Q: What causes NOx sensors to fail?
A: Several factors — extreme heat and rapid temperature fluctuations, soot and carbon build‑up, oil or coolant contamination of exhaust gases, water ingress, poor combustion or excessive exhaust deposits — can degrade the ceramic sensor element or clog the sensing tip.

Q: Is installation as simple as unscrew & replace?
A: Replacing the sensor itself is straightforward mechanically (unscrew old sensor, screw in new one), but correct installation matters — proper sealing, correct tightening, and ensuring wiring/connectors are intact. After installation it’s also recommended to clear old fault codes and allow the ECU/SCR system to re‑calibrate.

Q: Will replacing the NOx sensors guarantee no more emission‑system faults?
A: If the fault was caused by failing or clogged sensors, then yes — replacing them should restore accurate NOx readings and correct emissions system operation. However, if the underlying issue is elsewhere (e.g. SCR catalyst, injection system, EGR, fuel system), then further diagnostics may be required.