What is a Diesel Particulate Filter (DPF)?

Author: Roslyn Green  Date Posted:1 October 2017 

Does Your Vehicle have a DPF?

What is a DPF?

A Diesel Particulate Filter (or DPF) is a device designed to remove diesel particulate matter or soot from the exhaust gas of a diesel engine.

How does it work?

As with any filter, they ‘filter’ or trap particles, in this case harmful diesel exhaust soot particles. The DPF needs to be cleaned regularly to maintain performance. This is done through a process called regeneration, either active, passive or forced regeneration, the accumulated soot is burnt off at high temperature (around 600°c) to leave only a residue of ash, effectively renewing or regenerating the filter, ready to take on more pollution from the engine.

How do I know if my vehicle is fitted with a DPF?

  1. Depending on your vehicle there are many locations for these to be in, generally the DPF will be close to the Engine. In the first half of your vehicle, follow your exhaust from front to back and see if any of the exhaust has sensors or metal tubes coming out of it similar to the above attached photo.
  2. DPF’s are only found in Diesel Vehicles.
  3. Some manufacturers have stickers inside door jams or under the bonnet specifying if they have a DPF fitted or not. Please note: Not all manufacturers do this.
  4. Most vehicles Pre 2006 will not have a DPF, DPF’s are a new emission device in Australia for Passenger Vehicles. European model vehicles are more common for having a DPF fitted but as of 2016 all newly manufactured vehicles are required to have a DPF.

Why does this affect the fitment of an Aftermarket Exhaust?

Removing your car's Diesel Particulate Filter (DPF) might be tempting, because the damage caused by a clogged DPF can result in a four-figure repair bill.

But the DPF is there for a reason, to stop pollution to the atmosphere.

The DPF uses the ECU to work, the DPF will tell the ECU when it needs to regenerate, do a Burn (Regeneration) or tell it that it is up to 80% of its life and is due for replacement.

If you remove the DPF to fit an aftermarket exhaust your vehicle will not run correctly due to the pressure sensors being atmospheric and the 2-3 sensors not having a sufficient reading for the ECU, which could in fact cause your vehicle to go into Limp Home Mode.

Is it Illegal to remove the DPF?

Yes, it is illegal to remove your Diesel Particulate Filter if your vehicle was fitted with one from factory.

Read more about Diesel Particulate Filters here.

At Scott's Rods, we offer diagnosis & repair or replacement of your vehicles Diesel Particulate Filter, just call us on (07) 3812 0266 for a quote.

We are located at 25 Belar Street, Yamanto, Queensland, 4305.