Mercedes Diesel Filter (DPF) Regeneration Procedure

Mercedes Diesel Filter (DPF) Regeneration Procedure

Mercedes-Benz Diesel Particular Filter (DPF) may build up excessive soot content, leading to exhaust restriction, and eventually, the check engine light turns on. If you have a diesel Mercedes-Benz and are quoted a new DPF filter, ask the mechanic to carry out a forced DPF regeneration.

In some cases, DPF regeneration may need to be done twice to clean a clogged DPF. Replacing the DPF is rarely required and may only be required in sporadic cases. Typically DPF replacement is not needed if the vehicle has less than 200,000.

Mercedes-Benz DPF Regen Tools

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  2. Mercedes-Benz Star Diagnostic Scanner
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With the last two scanners, make sure the engine is running. The DPF regen function may be listed under the ECU > Adaptations, or it may be listed under the Reset Menu available before you select the model.

How to Regenerate Mercedes-Benz DPF

This guide will show you how to carry out DPF regeneration with a  diagnostic scanner.  This is called a forced regeneration and can be performed if passive DPF regeneration has failed.

Before starting:

  • The vehicle will need to be driven.
  • Two people are required.
  • DPF regeneration takes about thirty minutes.
  • No other fault codes should be active except DPF – Ensure no engine-related fault codes are present (they will prevent the DPF from starting)
  • Ensure there is at least 20% fuel in the tank
  • Risk of fire. The exhaust temperature is exceptionally high during this procedure and can reach 700 °C.

Here is how to regenerate Mercedes DPF: To perform this procedure, you will need a Mercedes-Benz Diagnostic Scanner that supports the DPF regeneration function. The menu names may vary slightly between scanners but the same for all scanners. DPF regen steps below apply to Mercedes Star Diagnostic C3 and C4 scanners.

  1. Connect your scanner to the diagnostic port under the dashboard. Start the engine and let it idle in Park. Mercedes DPF reset regeneration
  2. Power up the scanner and select the Mercedes-Benz model.  Select Control Units. mercedes ecu to generate dpf
  3. Next select Special Functions mercedes dpf regeneration special function
  4. Select Regeneration of Diesel Particulate Filter when driving. DPF regenerationdpf regeneration
  5. Once the DPF regeneration is completed successfully, don’t turn off the engine immediately. Instead, keep the engine running until the temperate sensor upstream of the diesel particulate filter (B19/9) has dropped below 400 degrees Celcius.  MB dpf regen procedure requirementsmercedes dpf regeneration
  6. After DPF regeneration, clear the ECU and make sure no other fault codes are present.
  7. Test drive the vehicle for fifteen minutes to ensure the check engine does not come back on. If the check engine light still comes back on

Notes

  • Follow the instructions under the DPF regeneration menu.
  • You will need to drive the vehicle at speeds of 35mph or higher.
  • Try to keep engine RPMs between 2000 and 4000. If you slow down, downshift the transition gear so that the RPMs remain in the recommended range.
  • Two people are required to complete this test.

An auto mechanic should perform this procedure. The following video shows how Mercedes DPF regeneration is performed.

Mercedes DPF regeneration should not be performed if there are oil leaks near the exhaust system.

What is important to realize is that passive DPF regeneration is usually activated automatically periodically, but certain conditions must be met. Usually, the regeneration process occurs on extended highway trips without the driver realizing it. If passive DPF regeneration fails frequently and forced DPF regeneration is often required, it could indicate an underlying problem with the engine.

This guide shows you how to perform DPF regeneration on a Mercedes-Benz. We are working on a 2011 Mercedes-Benz R350 with the check engine light and a code for excessive soot built up on DPF. The procedure is the same for other MB vehicles, including Sprinter. A Mercedes-Benz dealership diagnosed this vehicle, and the owner was quoted over $4000 for a new DPF.

Passive DPF Regeneration

Passive DPF regeneration is when the vehicle starts the DPF regeneration automatically while driving to burn off soot build-up on the DPF. Passive DPF regeneration only starts when certain conditions are met. Typically after driving on the highway for at least ten minutes and when no fault codes exist in the ECU, if the required conditions are not met, passive DPF regeneration will fail, leading to excessive exhaust soot built up on the DPF.

Forced DPF Regeneration

If multiple attempts to start passive DPF regeneration fail, your mechanic may have to force DPF regeneration.  One of the most common indications you need to regenerate the DPF filter is check engine light comes on, the vehicle may get stuck in limp mode, and a fault code indicating soot content is too high gets stored in the ECU.

Symptoms

Symptoms of a clogged Mercedes Diesel Particulate Filter (DPF) with high exhaust soot content include:

  • Check engine light on
  • Loss of power
  • Limp mode
  • A decrease in fuel economy
  • No throttle response
  • Car struggles to start.
  • Failed emission test

A  variation of the following fault code may also be stored in the ECU:

  • P243609 – The soot content of the diesel particulate filter is not ok or too high. There is a component fault.

What are the symptoms of a clogged DPF filter?

The first thing you will notice if there is a problem with the DPF filter is that the check engine light comes on. DPF regeneration failed to start automatically at this point, usually because of too many short trips. A mechanic can follow the instructions below to carry DPF regeneration. In some cases, if DPF regeneration is not started for an extended period, the vehicle may go into limp mode.

Do I need to carry DPF regeneration myself?

Yes, but you need a professional scanner that can start DPF regeneration.

Can I remove the DPF system?

Several aftermarket kits allow you to manipulate the Engine Control Unit and remove the Diesel Particulate Filter and, in some cases, the whole BlueTec system. You may even find a company that will remove the DPF.  Removing the diesel particulate filter is not legal in most countries. Vehicles with no DPF have much higher harmful emissions.

While removing a Mercedes DPF filter is illegal in most countries, cleaning the DPF system is legal and a more cost-effective alternative to replacing the DPF. Many companies offer DPF cleaning services, and a quick search should reveal a few places near you. DPF cleaning is typical for trucks, but the same procedure can be performed on diesel Mercedes-Benz vehicles.

We hope you find the Mercedes Diesel Filter (DPF) Regeneration Procedure guide helpful. Check these troubleshooting and repair guides for more help on your Mercedes-Benz.

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