Question 1

What are the symptoms of a failing Emissions & Exhaust on a T1N · NCV3 Sprinter?

Accepted Answer

Check engine light with a countdown to "no restart" or a reduced-speed warning on the cluster Limp mode after highway driving, or regeneration cycles that never complete Strong diesel or ammonia smell, visible soot, or a rattling exhaust component Fuel economy dropping several MPG with no change in how the van is driven AdBlue/DEF consumption climbing or a DEF quality warning that returns after a top-up

Question 2

Which fault codes point to this T1N · NCV3 Sprinter repair?

Accepted Answer

P2002 / P244A / P244B: Particulate filter efficiency or differential pressure out of range. P20EE / P207F: SCR catalyst efficiency below threshold. P229F / P2201: NOx sensor circuit or signal implausible. P0401 / P0404: EGR flow insufficient or EGR position performance. P042E: EGR/exhaust flap stuck open. Confirm with a scan tool before ordering — codes narrow the system, not the exact part.

Question 3

Does Mercedes Sprinter Upstream Oxygen Sensor – Bosch | T1N / NCV3 OM647 & OM642 | #0035427118 (2003–2012) fit my Sprinter?

Accepted Answer

Listed for T1N · NCV3 Sprinter, 2003–2012, OM642 / OM647 engine. Cross-reference 0035427118 against the number on the component you are replacing. Listed for the T1N generation (2002–2006). Parts are not interchangeable across generations, so confirm the chassis before ordering. Listed for the NCV3 generation (2007–2018). Part numbers can differ within a generation by year and engine code — send the VIN and we'll confirm the exact number. This part is listed for the OM642 / OM647 engine code. Confirm the code on your engine data plate or build sheet matches before ordering.

Mercedes Sprinter Upstream Oxygen Sensor – Bosch | T1N / NCV3 OM647 & OM642 | #0035427118 (2003–2012)

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