DPF Cleaning

We use a high grade cleaning fluid to remove deposits from the DPF. For this we require an amount of 'Liqui Moly' Cleaner, purge, a pressured tank, spray gun and probe. The cleaning fluid is sprayed into the DPF filter at a fixed pressure and allowed to break down the build up inside. It is then purged with a another cleaning fluid to remove any of the Liqui Moly cleaner left in the DPF. A regeneration is then forced by running the car at high revs to burn off any of the deposits left in it. We also use a Carbon Tec HHO to carry out a similar process.

Book A DPF Clean

Choose a time & date that suits you and we'll call to confirm your D.P.F. clean.


What is a DPF?

Since 2009, the exhaust emissions standards for new cars have effectively forced the fitment of a Diesel Particulate Filter (DPF) in the exhaust of diesel cars. Their aim is to reduce the soot that is created by burning the fuel by upto 80%. While effective for an initial period, it’s often troublesome when the filter fills with soot, and causes a partial blockage in the exhaust system causing a dashboard error light and a massive performance reduction.

What are the causes?

  • Frequent short journeys where the engine does not reach normal operating temperature
  • Wrong oil type – DPF equipped cars require low ash, low sulphur engine oils
  • A problem with the inlet, fuel or Exhaust Gas Recirculation (EGR) system causing incomplete combustion will increase soot loading.
  • A warning light on or diagnostic trouble code logged in the engine management system may prevent active or catalyst regeneration
  • Low fuel level will prevent active regeneration taking place. As a general rule ¼ tank is required
  • Oil counter/service interval – exceeding the service interval may prevent regeneration
  • Additive tank low or empty
    source: the

Do cleaning additives work?

NO. Additives added to the fuel system have been known to reduce emissions and soot from the fuel burning process which could reduce the chance of the DPF being blocked. Various cleaning fluids claim that their additive can unblock the DPF and extinguish the warning light, but if you’ve tried this you’ll know it’s simply untrue. By the time the additive has been through the combustion process there will be very little left of it, so it’s chances of unblocking the filter will be minimal to none.
Only cleaning additives injected directly into the DPF by trained technicians can break down the deposits, which are then flushed out and burnt off through regeneration.

But my car regenerates itself?

True.. to some extent.
Regeneration in the car itself is a high-temperature burning of the soot, which turns it into a thinner, exhaustable ash which is blown out through the exhaust system.
Passive regeneration takes place whilst you’re driving, and is managed by the vehicle’s ECU, however it can only take place while the exhaust runs at high temperatures so short runs to the shop and urban trips won’t allow this to happen.
Active regeneration initiates a post combustion fuel injection to increase the exhaust temperature and trigger regeneration. If the journey is too short while the regeneration is in progress, it may not complete and the warning light will come on to show that the filter is partially blocked. Those quick journeys to the shop won’t allow this to happen.

How do I know when it needs doing?

When the soot has built up to around 70% it’s important that the car has a long, fast run in order to regenerate. If this has not been done and the DPF reaches over 85%, then it will have to be removed and manually regenerated. If you notice a significant increase in regeneration cycles it is likely time for a DPF service.


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26 Sleaford Road

01522 791 240