Resolving AdBlue, DPF, EGR Issues and Errors in the Mercedes Benz Sprinter

Mercedes Sprinter W907 Removal solutions

Mercedes Benz sprinter was introduced in 1995. Its first generation, W901-905, was produced from 1995 to 2006.

The second generation of sprinter, W906, was introduced from 2006 to 2018, and its third generation, W907, is being produced since 2018.

In this case study, we want to explain AdBlue, DPF, EGR off in Mercedes Benz sprinter W907. We offer mentioned services for MB sprinter and for older models of W906 we have removal service for DPF & EGR.

Here are types of ECUs based on different engine variety:

• W906 OM646 engine with Bosch EDC16C2, EDC16CP31
• W906 OM642 engine with Bosch EDC16CP10, EDC17CP46
• W906 OM651 engine with Bosch EDC17CP57, Delphi CRD2, CRD3, CRD3P.B0, DCM3.5
• W907 OM651 engine with Delphi CRD3P.

Mercedes Benz sprinter AdBlue off:

As many other vehicles/ ECUS, you need to do some adjustments on MB sprinter after AdBlue/ SCR removal. In sprinter, it’s necessary to follow this procedure:

For Delphi CRD3 ECUs:

• Plug from AdBlue module must be disconnected.

For Bosch EDC17CP46 & EDC17CP10 ECUs:

• Plug from AdBlue module must be disconnected. (Also, sensors can be disconnected).

For Bosch EDC17CP57:

• AdBlue ECU AND NOx sensors must be disconnected.

Where is the AdBlue module located in W907 Sprinter?

The AdBlue control module (SCR / dosing unit) is often labelled N118/5 in wiring diagrams.

It is generally located inside the vehicle, on the right side of the cabin, behind or under a trim panel near the front passenger side or the driver’s footwell/ seat base area, depending on the variant. Some diagrams show “engine compartment, right” related to AdBlue control units, but those often refer to sensor/dosing parts, not the control module itself.

The module is often placed close to other vehicle electronic modules (ECUs, fuse/relay centers), but it’s positioned to be somewhat protected from heat and moisture.

How to access the AdBlue module?

1. Park, key off, battery negative disconnected if you’ll unplug connectors.
2. Slide the driver’s seat fully back (and tilt up the seat cushion if your seat has that feature).
3. Remove the lower kick panel / trim on the driver’s side (some clips / screws). Look behind the panel and at the seat base.
4. You should see a small ECU-style box with a multi-pin connector(s) and wiring harness’ that is the AdBlue control module (N118/5). It’s usually clipped to a bracket or mounted to the inner body panel. 

• To remove AdBlue module: You need to unplug connector(s) and remove mounting fasteners, and carefully lower the module. Keep connectors dry and take anti-static precautions. (some vehicles may require dealer reprogramming after replacement).

Where’s the Mercedes sprinter W906 AdBlue module located?

The module is located under the driver seat.

1. Access the seat base
2. Slide the driver’s seat all the way back.
3. Remove the plastic trim cover on the seat base (secured with clips/screws).

• On some versions you may need to undo a couple of Torx screws to lift the cover.

Locate the module:

Look inside the seat base; you’ll see several modules. The AdBlue ECU is typically a black rectangular unit with one or two connectors, often labelled with a Mercedes part number starting with A0009.

Disconnect wiring:

• Press the locking tab(s) on the connector(s).
• Pull the connector(s) straight off, notice that don’t pry with force.

Mercedes Benz sprinter DPF off:

For DPF removal it’s necessary to follow this procedure for all the ECUs:

DPF pressure and temperature sensor must be disconnected.

 

How to find the DPF pressure sensor, and where is it located for W906 models?

1. The DPF pressure sensor is usually located on the bulkhead/ firewall or on a bracket in the engine bay.
2. Two small rubber/ metal pipes run from the exhaust system (before and after the DPF) up to this sensor.
3. On 2.1L (OM651) and 3.0L (OM642) diesels, the sensor is normally found on the left side (driver’s side in LHD) of the engine bay, mounted to the firewall or inner wing.
4. If you trace the small pressure hoses from the DPF/catalyst area, they lead straight to the sensor.

How to identify DPF Pressure sensor For W907 models?

• The setup is similar: The DPF pressure sensor is mounted in the engine bay. Often on the bulkhead or inner fender area.
• Two pipes run back down to the DPF under the floor.
• Depending on the engine, OM651, OM654 or OM642, the exact spot changes slightly but it is always on a bracket in the engine bay for easy service access, not directly under the van.

How to identify it?

1. Small rectangular plastic sensor with an electrical connector.
2. Two small pressure lines connected (marked “high” and “low” pressure).
3. Mercedes part numbers often start with A642 905 or A651 905 depending on engine.

How to Identify the DPF temperature sensors, and where are they located For W906 models?

There are usually two or three EGT sensors around the DPF/ oxidation catalyst assembly:

1. Upstream temperature sensor: Before the oxidation catalyst/ DPF, mounted in the exhaust pipe.
2. Mid temp sensor; Directly in the DPF body, monitors filter core temperature.
3. Downstream temp sensor (after the DPF, sometimes after the SCR/AdBlue catalyst on Euro 6 models).

• They are threaded into the exhaust pipe or DPF housing, each with a single electrical connector leading up into the engine bay harness.

How to Identify the DPF temperature sensors, and where are they located For W907 models?

Same principle! There are 3 sensors around the DPF/ SCR unit.

1. Pre DPF (upstream EGT): In the exhaust pipe, before the DPF.
2. In DPF (core temp sensor): Screwed into the filter housing itself.
3. Post DPF (downstream EGT): In the pipe, after the filter, often just before or after the SCR/ AdBlue injector.

• Some versions add an extra SCR temp sensor downstream of the AdBlue catalyst for NOx control.

How to Identify DPF temperature sensors for Mercedes Benz Sprinter?

• They look like metal probes with a threaded base, similar to a lambda O2 sensor but a bit thinner, usually M12/M14 threads.
• They have heat resistant cables running up to the wiring harness. Often protected with metal braid or glass fiber sleeving.
• Mercedes part numbers for these typically start with A642 905… or A000 905…, depending on position.

If you need a tested AdBlue, DPF, EGR & DTC off file for your MB Sprinter, send us your ECU file and receive a professional solution in the shortest possible time.