Hi, the warning light for the dpf has been coming on intermittently (every second day)on my 27k Vrs diesel. What is it and where is it? Also the engine management light has been doing likewise. Could the two be linked? Fuel consumption has increased by 10% from 47/8 to 40/1.

Thanks.

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

Diesel Particulate Filters (DPF) : Diesel particulate filters - The AA

The catalytic coated diesel particulate filter is located in the exhaust system after the turbocharger,

within close proximity of the engine.

Reason for DPF light :

It means that lately, you have not been driving on too many long journeys, probably in and out of town, not giving the dpf sufficient time to heat up to its operating temp, and allowing the regeneration process to begin. There are two types of regeneration process:

Passive Regeneration:

With passive regeneration, the carbon soot particles are burnt off continually without intervention from the engine management system. The particulate filter is positioned in close proximity to the engine. This assures that exhaust gas temperatures of 350-500 °C are reached on motorways, for example. The carbon soot particles are thereby converted into carbon dioxide by a reaction with nitrogen oxide. This gradual process occurs slowly and continually through the platinum coating, which works as a catalyst.

Active Regeneration:

With active regeneration, the carbon soot particles are burnt off through a targeted increase in the exhaust gas

temperature by the engine management system. In urban traffic with low loads on the engine, the exhaust gas

temperatures for passive regeneration of the particulate filter are too low. Since the carbon soot particles cannot

be broken down, deposits build up in the filter. As soon as a certain level of carbon soot deposits is reached in the filter, active regeneration is initiated by the engine management system. This process lasts for approximately 10 minutes. The carbon soot particles are burnt off to carbon dioxide at an exhaust gas temperature of 600-650 °C.

From the flow resistance of the filter, the engine control unit can detect the level of carbon soot deposit in the filter.A high flow resistance indicates that the filter is in danger of becoming blocked. The engine control unit initiates an active regeneration process. To do this:exhaust gas recirculation is switched off to raise the combustion temperature,an extended injection period is initiated, after a

period of main injection with reduced quantity at 35° crankshaft angle after TDC, in order to increase

the exhaust gas temperature.

These measures lead to a targeted, brief increase in the exhaust gas temperature to approximately 600 °C to 650 °C. In this temperature range, the collective carbon soot oxidises to carbon dioxide. After this active regeneration period, the particulate filter is ready for operation again and can begin filtering carbon soot out of the exhaust gas.

In the event of signal failure from the exhaust gas pressure sensor, the particulate filter regeneration

cycle will be based on the distance travelled or the number of hours in operation. This cycle for

particulate filter regeneration, however, is not effective over a long period of time. After a predetermined number of cycles, the diesel particulate filter warning lamp will light up and the preglow control lamp will then flash in the dash panel insert. This informs the driver that the vehicle must be driven to a workshop

As Tom1362 wrote . . . when i had problems with my D.P.F light keeping on coming on the garage replaced the "exhaust pressure sensor" as there was an issue linked with the D.P.F & the sensor , since having it replaced i have never had any problems .

Also , what make of diesel do u use , i only use Shell in mine now as the supermarkets fuel was poo & i seem to get around 35-40 miles more from a full tank now

Edited 21 December, 200817 yr by smog monster

Hi, the warning light for the dpf has been coming on intermittently (every second day)on my 27k Vrs diesel. What is it and where is it? Also the engine management light has been doing likewise. Could the two be linked? Fuel consumption has increased by 10% from 47/8 to 40/1.

Thanks.

Most likely the two warning lights are linked.

Has you car had the 26E6 campaign update; that is a remap of the ECU and fitting of a modified & uprated exhust gas pressure sensor. More details can be found in this thread;- http://briskoda.net/octavia-ii/vrs-pd-170-engine-management-software-disk-part/120394/

My advice; get yourself down to your dealer and get it looked at/fixed; all under warranty naturally.

Good luck.

i have the 1.9 PD, how do i know reliably whether my car has DPF or not? in India where I own this car, we do not have lot of emission regulations so I am not sure if Skoda still keeps DPF in the car. i have access to VAG-COM if needed. thanks.

i have the 1.9 PD, how do i know reliably whether my car has DPF or not? in India where I own this car, we do not have lot of emission regulations so I am not sure if Skoda still keeps DPF in the car. i have access to VAG-COM if needed. thanks.

The sticker in the handbook or in the bootwell (next to tyre) will have code 7GG listed if it has a DPF.

Steve

i have the 1.9 PD, how do i know reliably whether my car has DPF or not? in India where I own this car, we do not have lot of emission regulations so I am not sure if Skoda still keeps DPF in the car. i have access to VAG-COM if needed. thanks.

I doubt that it has as the DPF is only fitted to 2.0L 170PD vRS and 2.0L 140PD in the Scout; not fitted to any of the Skoda UK 1.9PDs

Mine is the same - in the garage at the moment - its had the software upgrade and a new pressure sensor- but still does not work properly. The DPF light is on every day (you can get it to go out by following the instructions) and the engine management light wont go out. They claim it needs a new DPF (£1000) and apparently its driver fault for not driving it correctly - they can think again!

Glad to hear that others have the same problem.

The car is less than 12 months old and done 22,000 miles.

Mine is the same - in the garage at the moment - its had the software upgrade and a new pressure sensor- but still does not work properly. The DPF light is on every day (you can get it to go out by following the instructions) and the engine management light wont go out. They claim it needs a new DPF (£1000) and apparently its driver fault for not driving it correctly - they can think again!

Glad to hear that others have the same problem.

The car is less than 12 months old and done 22,000 miles.

I had the same problem with mine last summer and they fitted a new pressure sensor but it made no difference. They then traced the problem to a wiring issue, but I had to wait three weeks for the part of the loom they needed as it was on back order.

Now fixed and not had any problems since (touch wood!)

I agree, replacing the sensor and carrying out the upgrade is, IMHO in this case, an admission of responsibility. Had the ECU software been correct and the sensor functioned correctly then it 'may' not have happened and I think they will find it difficult to prove otherwise.

Mine is the same - in the garage at the moment - its had the software upgrade and a new pressure sensor- but still does not work properly. The DPF light is on every day (you can get it to go out by following the instructions) and the engine management light wont go out. They claim it needs a new DPF (£1000) and apparently its driver fault for not driving it correctly - they can think again!

Glad to hear that others have the same problem.

The car is less than 12 months old and done 22,000 miles.