What is a DPF?

You may have noticed that Maitland Motors have become a part of The DPF Doctor network, but what does this mean for you? (If you drive a petrol vehicle then nothing. Petrol vehicles are not fitted with a DPF, you don’t need to worry.)  

Our diesel customers may have heard or have had issues with their DPF, so how can we help you? 

What is a DPF? 

Your DPF (diesel particulate filter)  helps limit the amount of pollution (soot) emitted from diesel vehicles entering our atmosphere, improving emissions. New Euro 5 exhaust emissions legislation made it mandatory for all diesel to be fitted with a DPF from 2009 onwards.  

The DPF works by carrying out a process called DPF Regeneration. DPF regeneration is when the excess soot, which has been trapped and collected by the DPF, is burnt off at a very high temperature. Burning is activated in 1 of 2 ways, Passive or Active

Passive DPF Regeneration is activated when the exhaust temperature is high enough so that the DPF can do its job of burning off the soot. These high temperatures only take place at speeds of at least 40 mph driven for at least 15 minutes. In other words, a nice long drive on the motorway should activate your DPFs passive regeneration without you having to do anything special. You could have issues with this if you tend to take short, slow, stop-start journeys when the vehicle doesn’t have the chance to get to a high enough temperature to activate the process. Factors that could also cause issues inc, lack of maintenance, wrong oil or driving on empty.  

Active DPF Regeneration is activated when the filter reaches 45% capacity (soot collected) and fuel is injected automatically. This increase in fule makes the exhaust temperature rise so that it can then burn off the soot. Regeneration is activated on longer journeys, so again, if you tend to do low, slow miles, the DPF won’t have the chance to do its job. 

Looking after your DPF will save you costly repairs and help your diesel run safely and efficiently, new DPFs can cost at least £1000! So if you notice the DPF warning light is on, then taking your vehicle for a nice long drive may be all that’s needed to start the regeneration process (especially if you’ve been working from home or not travelling much). If your light is still on or it’s stating a full DPF it may be time for an expert in DPF care to inspect and diagnose the issues. 

Alongside the leading industry knowledge and products from our friends at The DPF Doctor, we can help keep your DPF running and doing its job. Firstly, we would be to carry out a DPF Assessment, which includes specific tests and measurements using our extensive training. This costs £75 + vat and you will be given a full report on the condition of your DPF and what the next steps (if needed) are to get your DPF running smoothly and efficiently again.  (All works advised are under no obligation.)

Please call or email our office with any questions or if you would like to book a DPF assessment.