The DPF Problem
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There are lots of problems and checks that need to be addressed before a
Stricter rules for diesel car emissions
There are stricter limits for emissions from diesel cars with a diesel particulate filter (
Once you have made the conscious decision to remove the
- Do not remove the
DPFuntil the ECU software that controls the DPFhas been removed. This is because if you remove the DPFbefore the software solution has been added and the remapping company you use cannot apply the software solution or delete then you are stuck with a vehicle with no DPFand no solution to remove all the warnings and fault codes that will be generated. The vehicle will be underpowered and smoke heavily!
- You Must always conduct a full
DPFregeneration be it static through diagnostics equipment or a forced regeneration where the car is put into regen mode but must be driven straight after the diagnostic session has ended before the DPF removal.
- Once your ECU remapper has visited the vehicle and has successfully deleted the
software (This will take around 1hr or less to complete depending on vehicle type). DPF
- You can now instruct a garage to remove the
DPFfilter from the vehicle and remove the insides of the filter. Care must be taken when removing the inners as you don’t want to damage any sensors that are housed inside the DPF housing, as they still perform a diagnostic role on some cars. If any of the sensors get damaged then you will have to get the ECU remapper out again pay more money to remove the permanent fault codes generated from the damaged DPFsensors. If the sensors are worn, some vehicles will require a sensor replacement further added to the cost. Example: Temperature sensors, DPF pressure differential sensors and rubber piping.
- Once the filter housing has been replaced back on to the vehicle you are good to go. It is always worth changing the engine oil as this will be contaminated with diesel.
Common Faults With DPF Filters
- Faulty Sensors
- Fully blocked DPF because the car has not been able to conduct a full regeneration.
- AdBlue or Eoyls tank is empty if fitted.
- Pressure differential pipe work split.
- The most missed diagnostic is that the DPF is just full of ASH!
Guide To Cost's
- ECU Software Delete £250 this normally comes with a remap of your choice.
- DPF Removal £300-£600 in total.
- DPF Cleaning Using Ultra-sound & Bath £275-£350 depending on the size of DPF. (Ash Content Removal)
- DPF Static Regeneration around £100-£150
- Cgon Hydrogen Additive System purely preventative measure £459 all in.
- Hydrogen Cleaning (Hydro Clean) of the DPF £100 – £150.
- DPF Reversions this is if your vehicle has failed the latest MOT because the DPF has been removed. You will need the ECU Software re-instated and a new DPF placed back on the car typical cost £1,200 -£2,500.
DPF Ash Content Is To High
The only Solution is to have the DPF removed and professionally cleaned. This will remove the ash content from the DPF and maybe give you another 15-25k miles of service. This procedure normally takes 2-3 days from start to finish but it really depends on how time efficient your garage is that supplies the service. The cost of this service can range depending on the vehicle type and DPF type. But it will be significantly cheaper than a DPF replacement.
There are a few preventative measures that can be taken to stop your vehicles DPF from becoming prematurely blocked they are as follows:
- Drive the vehicle up and down the motorway and get the DPF into a natural state of regeneration at least once a week.
- Try to use a high grade of fuel maybe 1 in every 3 tank fills.
- Regularly conduct a Hydro Clean.