How to Fix AdBlue, DPF & EGR Issues on Mercedes Sprinter W907

The Mercedes-Benz Sprinter was first introduced in 1995. Its initial generation, W901–W905, was produced from 1995 to 2006. This was followed by the second generation, W906 (2006–2018), and the current third generation, W907, which has been in production since 2018.

In this case study, we focus on AdBlue, DPF, and EGR removal solutions for the Sprinter W907. In addition, we also provide DPF and EGR removal services for earlier W906 models.

ECU Types by Engine Variant

Before performing any modification, it is essential to identify the correct ECU type:

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

Each ECU requires a specific approach when applying AdBlue, DPF, or EGR removal solutions.

AdBlue (SCR) Removal on Mercedes Sprinter

Similar to other vehicles, performing an AdBlue (SCR) removal on the Mercedes Sprinter requires both software adjustments and hardware actions. Without proper handling, the system may continue to trigger faults or warning messages.

Required Actions by ECU Type

• Delphi CRD3 ECUs: The AdBlue module connector must be disconnected
• Bosch EDC17CP10 & EDC17CP46 ECUs
  • The AdBlue module connector must be disconnected
  • In some cases, related sensors can also be disconnected
• Bosch EDC17CP57 ECUs: Both the AdBlue ECU and NOx sensors must be disconnected

Proper execution of these steps ensures that the AdBlue system is fully disabled without causing recurring errors or dashboard warnings.

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?

To safely access the AdBlue control module on the Sprinter W907, follow these steps:

Prepare the vehicle

• Park the vehicle on a stable surface
• Turn off the ignition
• Disconnect the negative battery terminal if you plan to unplug any connectors

Adjust the seat

• Slide the driver’s seat fully backward
• If applicable, tilt the seat cushion upward for better access

Remove interior trim

• Take off the lower kick panel or trim on the driver’s side
• This may involve removing clips or screws
• Check both behind the panel and around the seat base area

Locate the module

• Identify a small ECU-style unit with multi-pin connectors and wiring harnesses
• This is the AdBlue control module (N118/5)
• It is typically mounted on a bracket or attached to the inner body panel

AdBlue Module Removal

To remove the module:

• Carefully unplug all electrical connectors
• Remove the mounting fasteners
• Gently lower and take out the module

Important notes:

• Keep all connectors dry during the process
• Follow anti-static precautions when handling electronic components
• In some cases, module replacement may require dealer-level reprogramming

Where is the AdBlue Module Located in Sprinter W906?

On the Sprinter W906, the AdBlue control module is typically located under the driver’s seat, inside the seat base compartment.

How to Access the Module

• Adjust the seat: Slide the driver’s seat fully backward

Remove the seat base cover

• Take off the plastic trim cover on the seat base
• The cover is usually secured with clips or screws
• On some versions, you may need to remove additional Torx screws

Locate the AdBlue module

• Look inside the seat base where multiple control units are installed
• The AdBlue ECU is typically a black rectangular module
• It usually has one or two connectors
• Mercedes part numbers often start with A0009

Disconnecting the Module

• Press the locking tabs on the connectors
• Pull the connectors straight out
• Avoid using excessive force or prying tools

Mercedes Sprinter DPF Removal

For proper DPF removal, the procedure is similar across all ECU types.

Required Hardware Actions

Disconnect:

• DPF pressure sensor
• DPF temperature sensors

Proper disconnection of these components is essential to prevent fault codes and ensure the ECU modifications work correctly.

How to Identify the DPF Pressure Sensor on Sprinter W907

On the Sprinter W907, the DPF pressure sensor is typically mounted in the engine bay, rather than underneath the vehicle.

It is usually located on the bulkhead (firewall) or attached to the inner fender, depending on the engine configuration. While the exact position may vary slightly between engines such as OM651, OM654, or OM642, the sensor is always installed on a bracket in the engine bay for easy access and servicing.

Two small pressure pipes run from the exhaust system (before and after the DPF) down to the sensor, allowing it to measure pressure differences across the filter.

How to Identify the Sensor

You can recognize the DPF pressure sensor by the following characteristics:

• A small rectangular plastic housing
• An electrical connector attached to the unit
• Two pressure lines connected to the sensor, typically marked as:
  • High pressure
  • Low pressure
• Mercedes part numbers often begin with:
  • A642 905
  • A651 905 (depending on engine type)

Proper identification of the DPF pressure sensor is essential before performing any disconnection or modification to avoid confusion with other components in the engine bay.

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:

• Upstream temperature sensor: Before the oxidation catalyst/ DPF, mounted in the exhaust pipe.
• Mid temp sensor; Directly in the DPF body, monitors filter core temperature.
• 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.

• Pre DPF (upstream EGT): In the exhaust pipe, before the DPF.
• In DPF (core temp sensor): Screwed into the filter housing itself.
• 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 reliable AdBlue, DPF, EGR, and DTC removal solution for your Mercedes Sprinter, you can send us your ECU file and receive a tested, ready-to-use file in the shortest possible time. Contact AutoExplain via WhatsApp: +1 (936) 289 6695.