Mercedes-Benz Citan Oxygen Sensor Replacement Parts

The Mercedes-Benz Citan has been sold primarily with diesel engines in the UK, and diesel engines do not use traditional lambda (oxygen) sensors in the same way petrol engines do — they use NOx sensors and, on later Euro 6 models, SCR-related sensors instead. If your Citan is diesel, you almost certainly do not have a conventional oxygen sensor, and what you may actually be looking for is a NOx sensor, a temperature sensor, or a Lambda sensor associated with the SCR/AdBlue system. Confirm the exact sensor reference against your registration with a breaker, as the correct part description matters for ordering the right component.

The Mercedes-Benz Citan W415 (2012–2021) was offered with a petrol engine in some European markets, and petrol variants do use conventional oxygen (lambda) sensors in the exhaust system, typically one upstream and one downstream of the catalytic converter. If your UK-registered Citan is a petrol variant, it will have oxygen sensors, and the correct one will be determined by your engine code and emissions standard (Euro 5 or Euro 6). Always quote your registration and engine code to the breaker to ensure you get the right sensor for your exact build.

The W415 Citan ran from 2012 to 2021 without a full generation change, but emissions legislation updated across that period, and sensors tied to the exhaust and emissions system can differ between Euro 5 and Euro 6 era vehicles even on the same platform. The year boundary between Euro 5 and Euro 6 compliance is a meaningful one for exhaust-related parts, so a sensor from a pre-2016 vehicle may not be a straight swap onto a later Euro 6 model. Name this boundary to the breaker and confirm whether the donor vehicle's engine code and emissions standard match yours before purchasing.

Trim or load-rating designations like 108, 109, and 111 on the Citan refer to payload and engine output variants, and trim level itself does not determine oxygen sensor fitment. What matters is the engine code and the emissions standard (Euro 5 or Euro 6) of your specific vehicle, not whether it is badged as an 108 or 111. Confirm your engine code with the breaker alongside your registration to identify the correct sensor.

Give the breaker your full registration number, your engine code (found on the vehicle identification plate or service history), and confirm whether your vehicle is petrol or diesel, as diesel Citans do not use conventional oxygen sensors. Also let them know your emissions standard if you know it — Euro 5 or Euro 6 — since exhaust-system sensors are emissions-era specific and a part from the wrong era may not work correctly or could affect your MOT. The more detail you provide, the better the breaker can cross-reference the correct part from the donor vehicle.

On diesel Citan variants, which make up the majority of UK examples, a NOx sensor is far more likely to be the correct part than a traditional oxygen sensor — diesel engines monitor exhaust gases differently, using NOx sensors to manage emissions, especially on Euro 6 vehicles with SCR/AdBlue systems. If your dashboard is showing an emissions-related fault or a sensor warning, ask the breaker specifically about NOx sensors or exhaust temperature sensors rather than lambda or oxygen sensors. Confirm the exact fault code from a diagnostic scan before ordering, as this will point you to the right sensor type.