Okay I'm a bit dumbstruck today as I got an error message displaying on my Octavia MK4 1.4 TSI PHEV Combi as I always thought DPF (particulate filter) only existed on diesel vehicles.

The dashboard is displaying "particulate filter regeneration required" refer to the vehicle wallet message!

Am I missing something here? Or doesn't mean something else?

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11 minutes ago, Stonekeeper said:

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Only problem is, as I have stated above my car isn't diesel, TSI engines are gasoline E10 fuel.

12 hours ago, Octawia said:

Only problem is, as I have stated above my car isn't diesel, TSI engines are gasoline E10 fuel.

First thing first:
DPF - diesel particulate filter
GPF - gasoline particulate filter
most recent gasoline engines also have a particulate filter, in order to comply with Euro 6(d) standard.
You probably need to drive for a longer distance using your internal combustion engine and NOT using the lowest revs possible.

long or not, most important is time, heat, stress.. can be climbing uphill too.

when i had eu5 tdi, i did regens climbing on a hill. since i dont live near highway its 10km road uphill and mountin is 1000 m heigh. at the top of mountain, all was cleared, i drove in same gear all way.

o i see now, isnt like on diesels, but run and idle, more air, lean mixture and temperature rises. but how is possible that exhaust reach high temperatures, but nothing happens to pistons and valves.

Edited 14 January14 Jan by imart143

It is in the Owners Manuals for Skoda / VW etc. It will be a growing issue. Plenty threads on GPF,s here. And ask Skoda Dealers about price of GPF replacements. Shrugs shoulders. PHEV,s might really become an issue.

2 hours ago, SkOmk4 said:

First thing first:
DPF - diesel particulate filter
GPF - gasoline particulate filter
most recent gasoline engines also have a particulate filter, in order to comply with Euro 6(d) standard.
You probably need to drive for a longer distance using your internal combustion engine and NOT using the lowest revs possible.

GPF regens differ from DPF and do regens during throttle-off overrun.

Get up to speed in ICE mode and allow to run down, best would be on fairly steep down-slope.

Edited 14 January14 Jan by Warrior193
clarification

2 hours ago, SkOmk4 said:

First thing first:
DPF - diesel particulate filter
GPF - gasoline particulate filter
most recent gasoline engines also have a particulate filter, in order to comply with Euro 6(d) standard.
You probably need to drive for a longer distance using your internal combustion engine and NOT using the lowest revs possible.

Thanks for this information I wasn't aware that the new type gasoline engines have GPFs (oh ffs!).

Any idea on how to regen it properly?

Just now, Octawia said:

Thanks for this information I wasn't aware that the new type gasoline engines have GPFs (oh ffs!).

Any idea on how to regen it properly?

^^^See above.

19 minutes ago, Warrior193 said:

GPF regens differ from DPF and do regens during throttle-off overrun.

Get up to speed in ICE and allow to run down, best would be on fairly steep down-slope.

so when i go uphill, on diesels DPF will clean, when i go downhill, on gasoline cars GPF will clean (lean mixture.)

2 hours ago, imart143 said:

so when i go uphill, on diesels DPF will clean, when i go downhill, on gasoline cars GPF will clean (lean mixture.)

Well, that's not actually 100% true, because going downhill with the present technologies the car will either do a lot of coasting, or if it will not coast but it will use engine-braking - there will be no gasoline in the "mixture".
The user manual quoted above does indicate/suggest a normal procedure to clean the GPF.

5 minutes ago, SkOmk4 said:

The user manual quoted above does indicate/suggest a normal procedure to clean the GPF.

I guess it does not apply to PHEVs, does it? I can't think of how I could control engine rpm on PHEV.

It is high temperature to clean a GPF, much higher than a DPF. Thd first gpf,s were in thd mk3 Fabia 1.0 tsi and Octavia and some repirted issues soon aftef getting them. Then come covid time short runs. High rpm lasting tookng. Getting a PHEV running on petrol and the temp up regularly is going to be important.

2 hours ago, Edela said:

I guess it does not apply to PHEVs, does it? I can't think of how I could control engine rpm on PHEV.

Controlling RPM is not important when regenning a GPF - ensure vehicle is in ICE mode, disable coasting, get engine fully up to normal temperature, get up to speed and back-off throttle several times (probably ideal going downhill)

18 hours ago, Edela said:

I guess it does not apply to PHEVs, does it? I can't think of how I could control engine rpm on PHEV.

Well, on a fast road section (90-100 km/h and above) you know the ICE will run to maintain speed (unless the road is downhill). Furthermore, if you put the gearbox in S you will have complete manual control of the gear, therefore control over the rpms.
However, getting the GPF warning on a PHEV is quite rare, I'm assuming it must be triggered by a very clear pattern: a large number of very short trips in hybrid mode (not EV), without any long trip to break that sequence.

10 hours ago, SkOmk4 said:

Well, on a fast road section (90-100 km/h and above) you know the ICE will run to maintain speed (unless the road is downhill). Furthermore, if you put the gearbox in S you will have complete manual control of the gear, therefore control over the rpms.
However, getting the GPF warning on a PHEV is quite rare, I'm assuming it must be triggered by a very clear pattern: a large number of very short trips in hybrid mode (not EV), without any long trip to break that sequence.

You're correct putting into S mode would allow you to control the RPMs. I am driving around 30 km per day, mostly in hybrid mode. I'm just wondering if the air conditioning has affect on this as the temperatures are around minus 5° C and -18° C.

Yesterday I tried to regenerate the GPF just as you described above. The light didn't go off.

The air conditioning should not impact this process, since it uses an electric compressor, not a "mechanical" one, and electric heating before the engine water heats up. Did you check the temperatures (water/oil/gearbox) during your trip? If you drive 30/day I'm assuming it's 15 km each way, and it's possible that temperatures are still not optimal at the end of your trip, given the cold weather outside... (just an assumption)

Indeed, I forgot about S regime. It allows to go one gear down, so should be enough to get over 3000 rpm on motorway. Not giving full control though, not on regular PHEV at least. Only allows one gear down and only one gear up if rpm is high enough.

On 14/01/2026 at 12:30, SkOmk4 said:

Well, that's not actually 100% true, because going downhill with the present technologies the car will either do a lot of coasting, or if it will not coast but it will use engine-braking - there will be no gasoline in the "mixture".
The user manual quoted above does indicate/suggest a normal procedure to clean the GPF.

A GPF does not use petrol to burn off the soot, the soot is burned by the temperature inside the gpf.

A good run on the motorway at over 50mph consistently should clear the lamp. Revving its nuts off will just create more soot. that is why coasting downhill whilst hot can work.

People made this same mistake with DPFs revving hard under load creates soot.

Maybe different with a PHEV but ICE Skoda vehicles AC is disabled at 3*oC and below.

you think so? when is temperature 0°C or less, if i turn on AC, my side windows are clear, if i turn it off, little moisture appears. also when i turn on recirculation in cabin, AC automatically turns on to deal with moisture. AC not only cooling air but demoisturizing it.

@imart143 'I think' it tells you so in the Owners Manuals. As far as AC works it needs warmer air to operate for cooling. As to drying air, yes, and AC is not just about cooling. I have it on in freezing weather in my BEV at below freezing and heating full on at 28*oC to defrost / demist in a matter of minutes. Heat pump... For the Skoda ICE or PHEV,s now on sale maybe someone could look in their owners manaual and see what is said by Skoda / Manual writer.

Edited 16 January16 Jan by Evolution13

20 hours ago, Stonekeeper said:

A GPF does not use petrol to burn off the soot, the soot is burned by the temperature inside the gpf.

A good run on the motorway at over 50mph consistently should clear the lamp. Revving its nuts off will just create more soot. that is why coasting downhill whilst hot can work.

People made this same mistake with DPFs revving hard under load creates soot.

That's a big problem for me over here. I am only 200 km away from the Arctic circle. Current temperature is -5C and we call it hot, but trying to heat up the exhaust to 300C in this weather at high speed is a big challenge (although we have studded tires, I dare not speed).

Would it have an impact on the car if I wait until the summer 😂 or would it be get it done at some service point?

2 minutes ago, Octawia said:

That's a big problem for me over here. I am only 200 km away from the Arctic circle. Current temperature is -5C and we call it hot, but trying to heat up the exhaust to 300C in this weather at high speed is a big challenge (although we have studded tires, I dare not speed).

Would it have an impact on the car if I wait until the summer 😂 or would it be get it done at some service point?

What is the furthest you can go at a consistent speed and how fast?