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DIY DPF removal. Can you really do it yourself? It’s a question we get daily from disgruntled owners faced with a dealership DPF replacement/regeneration quotes, often of the four-digit variety.
So can you tackle this job yourself and replace/remove the DPF filter once and for all? Before we answer this, let’s think about what’s involved.
Yes, a DPF filter itself is a simple thing. A box with a honeycomb filter/mesh which stops/traps larger diesel exhaust particulates (soot) but allows the follow of normal exhaust gasses. What isn’t so simple are the sensors and ECU management which keep this system in check. Your car’s ECU is constantly monitoring the DPF sensors, checking back pressure and ensuring that it’s working correctly. In the event of a blockage / or high loading, it will trigger a DPF regeneration until sensors reach nominal levels. To complicate things further there are some systems which utilise ELOYS to reduce the temperature at which the soot can be “burnt off” the DPF.
Physical DPF removal
Physically removing the DPF typically isn’t what many would call a huge job. Some cars are harder than others but at the end of the day, it’s a serviceable exhaust component. Typically it should unbolt from the exhaust, however, on some vehicles, it requires a lot of jiggery-pokery depending on its location and in extreme cases the removal of the front subframe.
Once removed, the DPF is essentially just a filter. These are often simply cut open along the welded seams, drilled out and rewelded back again. Sounds simple!
Tricking the ECU
What isn’t fun and games is the electronics required to keep the car’s ECU happy that the DPF is working as expected. Our investigations have shown that some owners opt for adding resistors to the DPF sensors to try and trick the ECU in accepting false reading from the sensors, however, we’ve struggled to find a common solution at fits all cars.
Most drivers will opt for an ECU remap which removes the DPF system from the ECU entirely. This prevents the need for tricking the sensors as effectively the ECU no longer has any DPF control systems to worry about.
Is DIY the answer?
If you’re competent under a car with a set of spanners, there’s nothing stopping the would-be DIYer from taking the DPF off their car, A few cuts, DPF internal gutting, and a competent weld up just might be enough to hide your illegal actions from your local MOT tester but ultimately, it’ll be the ECU which will cause the biggest headache. Without the ability to remove the DPF from the ECU, you’ll be no better than you started, with DPF sensor readings rendering your vehicle in limp home mode for eternity.
Unless you’re a dab hand at ECU reprogramming, your only answer will be a remap which includes a DPF removal. Commonly, this offers a performance boost and removal of the DPF system from your car’s brain. “Great” I hear you say, but these often carry a price tag of at least £400 for removal by a reputable tuner.
You could opt to send your DPF to one of the many DPF cleaning companies who can remove the Ash buildup from the filter using fancy machines. They use specialist chemicals and extreme pressure in order to remove the Ash, not something you can do with a jet wash. Before you ask, Teraclean or one of the other carbon cleaning specialists CAN NOT do this by spraying sea foam through your inlet and running a “magic” DPF regen with a laptop.
So is it worth it?
Depending on your level of skills with the spanners, you might actually be better of replacing the DPF with an OEM unit from a supplier which specialises in “compatible” DPF filters. These often cost less than half that of a dealer supplied unit and could be fitted at home if you’re competent.
With the market for DPFs increasing due to an increased customer base of aging vehicles with DPFs fitted, the cost of DPF replacements is slowing coming down. Is it really worth the hassle, expense, and the police/insurance scrutiny should you be caught with a “modified” DPF on the road?
What would we recommend
Sat here on my high horse, it’s easy to say don’t run the risk of being caught with your DPF illegally removed. It isn’t worth the hassle, risk and expense should you be caught in an unfortunate accident. However, when presented with a bill for £1200 from a dealership or £500 for a DPF removal, I’m not sure I could take the high road on this one.
It’s a tricky situation and whichever road you take you’ll never escape the curse of the DPF whilst you still fill up from the diesel pump.
Let’s here from you!
Have you managed a complete DIY DPF removal, have you been stung with a huge DPF repair bill or been caught out by having your legally removed? Let us know in the comments below
For more information on DPFs you might also like to check out the following pages
Removing a Blocked Diesel Particulate Filter (DPF)
Removing Common Rail Diesel DPFs can be a labour intensive job as some particulate filters are part of the catalyst and therefore part of the exhaust manifold or front pipe assembly. These are often fitted as close to the engine as possible to help maintain a high temperature and to assist fast warm up. V6 and V8 engined vehicles may have two DPFs and are often even more difficult to work on due to obstructions like steering racks, sub frames and turbochargers etc., restricting access to exhaust manifold nuts or bolts. Older vehicles can present even more problems due to corrosion or seizure, in some extreme cases making it necessary for the garage to use oxy-acetylene burning equipment to remove the DPF.
After removing the DPF it will be necessary to either fabricate or purchase a replacement by-pass pipe ensuring that any exhaust pressure and temperature sensor take-off points are retained.
Eyeing-up the job – Refitting
Where possible, CRD Performance will remove the DPF assembly, empty its contents and seam weld it back together so that it still appears fully intact.
With the DPF now removed the engine management system still monitors its DPF pressure and temperature sensors to check they are present and working.
Without this, the ECU will detect an error, switch on the engine management light and enter ‘limp’ mode, rendering the vehicle almost undriveable.
Software Upgrade (aka DPF Deletion)
If the Diesel Particulate Filter is physically removed from the exhaust system and the ECU not remapped to accept the changes, then sooner or later the engine management system will go into ‘limp’ mode, or LOS (Limited Operating Strategy). When in limp mode the vehicle may have restricted power and, if fitted with an automatic transmission, it may even lock into top gear to limit acceleration.
While monitoring ‘pre’, and on some vehicles ‘post’, DPF differential pressures, the vehicles’ management system monitors the current state of the DPFs and detects if one or more are present. Software DPF removal involves reprogramming the vehicle’s ECU to ignore any abnormally high or low readings from either the pre or post DPF differential pressure sensors. As previously mentioned, it is still necessary for all DPF pressure sensors to be present and working. Software changes can only be made to open up pressure monitoring parameters, preventing regeneration, not to ignore the sensors altogether.
Software Power Upgrades
Some customers, while having their ECUs re-programmed to delete the DPF, take the opportunity to have their engine re-mapped for additional power, better driveability and better fuel economy. CRD Performance use several engine remapping companies for this purpose, who offer a discount if both programmes are carried out at the same time at our workshop in Bolton.
Will Dpf Removal Fail Emissions
DPF Emulators
On some vehicles, software DPF deletion is not possible; this is especially true for some Japanese and Asian vehicles. CRD Performance now have available a full range of emulators which are programmed specifically for each vehicle make and model. Installing these does not involve interfering with the vehicle’s ECU since the emulator is instead wired into several of the engine sensors. These units work by fooling the cars ECU into believing that the DPF is still present and maintained in a clean condition, therefore not requiring any regenerating, even though it has in fact been removed.
Swiftec Dpf Removal Software
Beware of cheap DPF Removals
We frequently have vehicles brought to us in Bolton to correct a previous attempt to remove a DPF that has gone horribly wrong. Often the vehicles are in an undriveable condition, stuck in ‘limp’ mode, with the engine management light on, yet no fault codes present.
Be very aware of cheap quotes – you have been warned! “Cheap today, dear tomorrow”.
How To Remove Dpf System
CRD Performance is the North West’s leading DPF removal specialist, providing DPF removal services for all Lancashire and Greater Manchester districts, including Manchester, Liverpool, Warrington, Blackpool, Bolton, Stockport, Preston, Blackburn, Oldham, St Helens, Chester, Rochdale, Southport, Birkenhead, Wigan, Burnley, Salford, Crewe, Wythenshawe, Ellesmere Port, Runcorn, Bury, Bootle, Wallasey, Huyton, Widnes, Sale, Macclesfield, Lancaster, Middleton, Stretford, Ashton-under-Lyne, Leigh, Swinton, Urmston, Walkden, Altrincham, Leyland, Skelmersdale, Eccles, Accrington, Darwen, Denton, Radcliffe, Tyldesley, Chorley, Chadderton, Prestwich, Hyde, Wilmslow, Winsford, Reddish, Northwich, Nelson, Ashton-in-Makerfield, Heywood, Fleetwood, Kendal, Whitehaven, Farnworth, South Turton, Workington, Formby, Saddleworth, Marple, Hindley, Ormskirk, Whitefield, Droylsden, Golborne, Westhoughton, Congleton, Stalybridge, Clitheroe, Rawtenstall, Penwortham, Royton, Failsworth, Colne, Little Lever, Little Hulton, Great Lever, Kearsley, Horwich and Worsley.