All Things Mk5 > How to Guides / Troubleshooting
diesel particulate filter problems
JosGt:
only had the car two weeks or so, and this light in the dash came on with a warning in the high line. checked the vw manual and it says to get rid of the light take the car for a 15min drive holding between 1800 & 2500 revs in 4th or 5th gear, did that and the light went out, Brilliant!!!!
did a long drive (90miles) then a few trips round town (all day round town) the following day and the bloody light has come back on, anyone know what options ive got????
Have been told that taking it to the dealer will result in them rev'ing the tits off it for 10mins clearing the fault code and charging me for the trouble, is that my only option, or is there an alternative??? its running really ''lumpy'' and ''boggy'' since the light issues. :sad1:
its an 08 Gt Tdi 170 with 62k on the clock.
hope someone has some thoughts for me, many thanks
jos
stealthwolf:
Probably a sensor issue.
apollo13:
I'm no expert but I think its a common problem with the 170's.
Made worse by lots of short journeys clogging the DPF up (hence it clearing after going on a long run or revving it!)
I think you can do a DPF delete?? I'm sure someone with more mechanical knowledge will be along shortly.
(I'll stick with the electronic stuff :grin:)
JosGt:
thanks Apollo13,
i hope the mechanics are logging on soon !!!!
jos
vRStu:
170 PD TDi were very prone to it. I know Audi offer a leaflet to anyone thinking of buying one to warn you of the issues, the text of which is below.
--- Quote ---Diesel Particulate Filter
If you are choosing a diesel vehicle it may be fitted with a diesel particulate filter (see below).
Diesel particulate filters (DPF) are becoming more common-place on diesel engines, particularly the 2.0L TDI pumpe-düse (PD) and common rail diesel (CRD). This is in order to reduce particulate matter in exhaust emissions as required by European legislation.
A DPF traps most of the soot (particulate matter) that is produced during diesel combustion and holds it until a certain soot level is reached. A process called ‘regeneration’ is used in order to clear the soot trapped in the DPF.
‘Regeneration’ occurs when the exhaust temperatures are around 500°C. There are two types of ‘regeneration’, passive and active:
Passive regeneration occurs on long motorway journeys, where the exhaust system gets very hot and burns off the soot unaided.
Active regeneration occurs when the soot level reaches a certain point in the DPF. The soot level is constantly monitored by the Engine Control Unit, which triggers ‘active regeneration’ when necessary, raising the exhaust temperature and burning off the soot.
Problems occur when the conditions for ‘regeneration’ are not met. This could be due to frequent short trips or stop/start driving when the ‘regeneration’ process does not run for long enough to be effective. There is a high risk of this in urban/inner-city/Channel Island areas. Additionally, vehicles that spend a lot of time idling (eg taxis), accumulate soot faster, hence the need for regeneration is higher.
When the DPF light illuminates, customers should refer to the Owners’ Handbook, which states: ‘The DPF symbol lights up to indicate that the diesel particulate filter has become obstructed with soot due to frequent short trips. When the warning lamp comes on, you should drive at a speed of at least 37mph and an engine speed between 1,800 and 2,500rpm for about 10 minutes. As a result of the increase in temperature the soot in the filter will be burned off. If the DPF symbol does not go out, please contact a qualified workshop and have the fault rectified.’
Assessing your needs
Vehicles fitted with a DPF may require drivers to adopt a slightly different driving profile in order for the DPF system to clean itself effectively. In order to assess your current driving profile, ask yourself these questions:
What is your typical driven mileage per day/week?
Do you drive frequent short journeys (typically less than two or three miles)?
Do you frequently experience a lot of stop/start driving i.e. heavy traffic?
Do you live, work or commute in an area where they could drive faster than 37mph for a period of 5-10 minutes? This does not necessarily need to be continuous (eg slowing for roundabouts/traffic lights)
If the answers to the above questions reveal that you:
a. Typically do very little mileage
b. Only travel a short distance in any one trip
c. Regularly travel in heavy traffic
d. Have no opportunity to drive above 37mph for a period of 5-10 minutes, in order for DPF regeneration to occur
Then the changes to the your driving profile necessary to effectively run a DPF vehicle could be too great for you to consider acceptable. You may want to consider a non-DPF vehicle (alternative diesel or petrol), which would be better suited to your normal usage.
--- End quote ---
These advertise removal - http://www.removemydpf.co.uk/vw-dpf-removal/ shocking website but it seems they are also called MoreBHP. http://www.more-bhp.com/contactdetails.html
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