Question about Suzuki Grand Vitara

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I have a DPF light that despite following the Suzuki guideliness to drive at certain speed for a certain amount of time, this light has not cleared. I have already had a sensor in the exhaust replaced that was making the light come on, but am still having the same problem. Is there another way to clean the DPF. My car has only travelled 28000kms since first purchased in March 2008, and has regular services every 6months using the manufactures recomended oil.

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A diesel particulate filter (DPF) collects particulates in the engine's exhaust, basically unburned fuel. Every so often the DPF will need to regenerate. What this means is when a certain amount of particulates accumulate in the DPF, a small amount of raw fuel is injected into the DPF to increase the temperature. The increased heat burns the particulates resulting in fewer nasty things going into the atmosphere. However, the regeneration process leaves a small amount of ash in the DPF which accumulates over time. You may have to have the DPF professionally cleaned (it's not a DIY thing) in order to restore its performance.

Posted on Mar 19, 2011

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  • Sharon James Jun 11, 2014

    if you buy this product

  • Sharon James Jun 11, 2014

    if you buy this product

  • Sharon James Jun 11, 2014

    Add a Commenthttp://www.multiecuscan.net/ this product will allow you to manually regenerate your dpf

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2012 Benz. are DPF sevic able


Hi David.
As far as i know the Mercedes DPF doesn't require a service.
2 important things you should keep in mind.
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2: drive with steady speed at 60 MPH as long as possible while you driving on motorway , this will clear/ clean the DPF.

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DPF sucks.
id take it to VW, to get this magic diesel smog crappppp fixed.
good luck.
ps. it fueling wrong, and DPF, is not it.
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Error code 55 on vauxhall meriva whats it mean


Error 55 is Diesel Particulate Filters (DPF)
Reducing diesel soot emissions by 80%

If you're buying a new car and plan to use it mainly for town-based, stop/start driving it would be wise to avoid a diesel car fitted with a Diesel Particulate Filter (DPF) because of the possible hassle of incomplete 'DPF regeneration'.

The exhaust emissions standards for new cars have effectively required fitment of a DPF in the exhaust of diesel cars since 2009 when the 'Euro 5' standard came into force. In fact, many cars registered before 2009 will have had one fitted too in anticipation of the change in standards.

Standards aim to deliver an 80% reduction in diesel particulate (soot) emissions but the technology's not without problems - AA patrols are regularly called to cars with the particulate filter warning light on indicating a partial blockage of the filter.

Even if your driving isn't mainly urban/stop-start, changes to driving style may be required to get maximum benefit from these systems.

How do they work?
Diesel Particulate filters (DPF) or 'traps' do just that, they catch bits of soot in the exhaust.

As with any filter (think of the bag in your vacuum cleaner) they have to be emptied regularly to maintain performance. For a DPF this process is called 'regeneration' - the collected soot is burnt off at high temperature to leave only a tiny ash residue.

Regeneration may be either passive or active.

Passive regeneration
Passive regeneration takes place automatically on motorway-type runs when the exhaust temperature is high. Because many cars don't get this sort of use car manufacturers have to design-in 'active' regeneration where the engine management computer (ECU) takes control of the process.

Active regeneration
When the soot loading in the filter reaches a set limit (about 45%) the ECU can make small adjustments to the fuel injection timing to increase the exhaust temperature and initiate regeneration. If the journey is a bit stop/start the regeneration may not complete and the warning light will come on to show that the filter is partially blocked.

It should be possible to start a complete regeneration and clear the warning light by driving for 10 minutes or so at speeds greater than 40mph.

If you ignore the warning light and keep driving in a relatively slow, stop/start pattern soot loading will continue to build up until around 75% when you can expect to see other dashboard warning lights come on too. At this point driving at speed alone will not be enough and you will have to take the car to a dealer for regeneration.

Expensive repairs
If you continue to ignore warnings and soot loading keeps increasing then the most likely outcome will be that you will have to get a new DPF costing around £1000.

DPF additives
The most commonly fitted type of DPF has an integrated oxidising catalytic converter and is located very close to the engine where exhaust gases will still be hot. This heat means that passive regeneration is possible.

There's not always space close to the engine though so some manufacturers use a different type of DPF which uses a fuel additive to lower the ignition temperature of the soot particles so that the DPF can be located further from the engine.

The additive is stored in a separate tank and is automatically mixed with the fuel whenever you fill up. Only very small quantities are used though so a litre of additive should treat around 2800 litres of fuel - enough to cover 25,000 miles at 40mpg.

You will have to pay to get the additive tank refilled at some time in the car's life, and we've heard reports of dealers charging up to £200 to re-fill a half empty tank.

AA experience
We're seeing some evidence of DPF systems failing to regenerate even on cars used mainly on motorways.

On cars with a very high sixth gear the engine revs may be too low to generate sufficient exhaust temperature for regeneration. Occasional harder driving in lower gears should be sufficient to burn off the soot in such cases.

With this type of DPF regeneration will be initiated by the ECU every 300 miles or so depending on vehicle use and will take 5 to 10 minutes to complete. You shouldn't notice anything other than perhaps a puff of white smoke from the exhaust when the process is completed.

There's no evidence in AA breakdown data that the problem's going away - newer car models seem just as likely to sufffer DPF problems if not driven 'correctly' as those built when DPF's were introduced.

Check the handbook
If you buy a car with a DPF fitted it's important to read the relevant section of the vehicle handbook so that you understand exactly what actions to take if the warning light illuminates and how, if at all, your driving style may need to be adjusted to ensure maximum DPF efficiency and life.

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1 Answer

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this is a complex car, and engines.
Just 1 code? and no pendings?
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the shop manual for all complex cars, is a must have.

P2 codes are factory codes, unique to only Suzuki ,
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alldata dot com has it.

"Particulate Trap Efficiency Below Threshold Malfunction "
but cleaning it , is not the only way to fix it.
the manual covers this, and how the test works and what can make it fail, simple swaps or cleans dont always work.
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I've found the following info at mazdaforum.com , which I will reproduce word for word:

If the Diesel Particulate Filter indicator illuminates continuously - Drive the vehicle at an engine speed of 2000rpm or higher and a vehicle speed of 40Km/h (25mph) or more for about 10 to 15 minutes to remove the particulate matter. The engine sound and smell may change as the particulate material is being removed.

If the Diesel Particulate Filter indicator flashes - Take your vehicle to a Mazda Authorised Repairer as soon as possible to prevent damage.


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