I have got hold of my first Yeti. 2010 diesel 2wd, high mileage but sound.

It doesn't seem to perform a regen.

I have tried using Vag dpf to monitor it but the temperature sensor readings always show zero. Could both sensors be faulty, there are no errors logged?

Welcome to the forum. Sounds like a winner if it runs well and has a valid MOT, maybe best leave well alone. Do you know the DPF has not been gutted out, the ERG coded out and a blanking plate fitted?

I don't know. But dpf has something in there. I put some Mannol cleaner in through the o2 sensor hole.

Surely the temp sensors would still report values.

I've recently bought an Octavia MK3 TDI vRS and have just now tried to determine health of the DPF. I've also got 0 degree temperatures and very high figures for "Distance since last regen" and "Time since last regen", though not quite as high as yours!

I do also have ash load above the max and negative figures for soot mass calc/measured, neither of which makes any sense, because the car drives fine, no excessive smoke, no warnings, no relevant faults reported by OBDEleven.

I don't understand what's going on. I'll probably make a separate post about it in case somebody has an idea.

Edited 4 April4 Apr by davegr
Adding temperature detail

3 hours ago, davegr said:

I've recently bought an Octavia MK3 TDI vRS and have just now tried to determine health of the DPF. I've also got 0 degree temperatures and very high figures for "Distance since last regen" and "Time since last regen", though not quite as high as yours!

I do also have ash load above the max and negative figures for soot mass calc/measured, neither of which makes any sense, because the car drives fine, no excessive smoke, no warnings, no relevant faults reported by OBDEleven.

I don't understand what's going on. I'll probably make a separate post about it in case somebody has an idea.

I just took the car for a half hour drive, because I wanted to see how these values would change. Most things stayed the same, only these changed:

Distance since last regen increased by 1 ... impossible, I drove for 25-30 minutes, a lot of it at 60mph

Time since last regen increased by 4 ... also impossible, since the drive was much longer than 4 minutes

I can only guess that the wrong parameters are being read. The strange thing is, both OBDEleven and my cheapo ELM adaptor with the Vag DPF app are reading the same values.

@mad_dad I'm curious if you have done or can do the same test?

Edited 4 April4 Apr by davegr

Same here. Two different OBD adaptors one bluetooth, one wifi.

Used phone and android head units for the App. Similar readings.

It's reassuring it's not just me, I was thinking of getting it looked at by a ECU remapper but won't bother now. I think I'll just scrap the VAG app and assume it's performing regens anyway.

I have cleaned the dpf with some Mannol cleaner now. All seems ok.

6 minutes ago, mad_dad said:

Same here. Two different OBD adaptors one bluetooth, one wifi.

Used phone and android head units for the App. Similar readings.

It's reassuring it's not just me, I was thinking of getting it looked at by a ECU remapper but won't bother now. I think I'll just scrap the VAG app and assume it's performing regens anyway.

I have cleaned the dpf with some Mannol cleaner now. All seems ok.

I have the same results with the OBDEleven app + dongle, so either there's an issue with my car or they're all reading the wrong values.

I can't bring myself to buy VCDS just for this.

10 hours ago, davegr said:

I have the same results with the OBDEleven app + dongle, so either there's an issue with my car or they're all reading the wrong values.

I can't bring myself to buy VCDS just for this.

Maybe it's a bit of a long shot but @SJFISHER67 seems to be the closest person to me with VCDS, so I wonder if he might be able to help? As I understand it, VCDS should be able to extract the correct data when other methods fail. (It seems I'm too new to this forum to send PMs, so sorry for asking here!)

@mad_dad Did you mean get it looked at by an ECU remapper to find the reason for the odd DPF figures or were you just separately considering a remap? Also, do you have any idea of your ECU version? I'm wondering if the Vag DPF app can't properly read some specific versions. Either that or perhaps unknown to us, both of our cars have already been remapped and that's why we're having this issue?

I was looking at getting EA189 fix reversal (or Dieselgate rollback). But decided it was not worth it for me, Car has 120k on the clock. Sw Version is shown in bottom LH corner of vag app.

Yes. Maybe older cars have different parameter interface.

1 minute ago, mad_dad said:

I was looking at getting EA189 fix reversal (or Dieselgate rollback). But decided it was not worth it for me, Car has 120k on the clock. Sw Version is shown in bottom LH corner of vag app.

Yes. Maybe older cars have different parameter interface.

I hadn't thought about that. Is there a way to tell if my car has the 'dieselgate' fix?

Sorry. It was unreadable.

Google it. 9977 suggests fix installed

Tried talking to remapped about it but he was just interested in selling a map reversal.

I tried off engine types but auto sele ted one seemed best.

@mad_dad It has just occurred to me that the distance/time since last regen would make sense if they were in metres and seconds. In your case that would be 50km and 24 hours, roughly.

Mine would be 34km and 15 hours roughly, which might make sense if they had actually increased anywhere near enough with my half an hour drive.

I think I'm going to take my car to an independent VAG specialist to see what they make of it.

Please update if you do.

Certainly haven't done 50km in the last 24hrs😄

On 05/04/2026 at 11:08, davegr said:

Maybe it's a bit of a long shot but @SJFISHER67 seems to be the closest person to me with VCDS, so I wonder if he might be able to help? As I understand it, VCDS should be able to extract the correct data when other methods fail. (It seems I'm too new to this forum to send PMs, so sorry for asking here!)

@mad_dad Did you mean get it looked at by an ECU remapper to find the reason for the odd DPF figures or were you just separately considering a remap? Also, do you have any idea of your ECU version? I'm wondering if the Vag DPF app can't properly read some specific versions. Either that or perhaps unknown to us, both of our cars have already been remapped and that's why we're having this issue?

He sure can, drop me a message.

2 hours ago, SJFISHER67 said:

He sure can, drop me a message.

Thanks for the reply!

The situation has moved on quite rapidly and the car has been officially rejected, going back to the dealer who sold it to me for a refund. He's trying to avoid that but I know the law is very much on my side.

I had an independent inspection of the car done and they found quite a lot of problems, with the big one being the EGR has been removed, DPF likely gutted, both coded out of the ECU (otherwise I would see errors/CEL would be on etc).

I should be picking up a brand new MK4 Octavia vRS tomorrow, if a bit of luck is on my side!

Thanks again

@davegr When was the MOT last done before you bought it? There are many vehicles the same out on the roads just as that one is and nobody picking up on them. Members here do it to their vehicles.

1 minute ago, Evolution13 said:

@davegr When was the MOT last done before you bought it? There are many vehicles the same out on the roads just as that one is and nobody picking up on them. Members here do it to their vehicles.

October... but this is not the only issue with the car. It's also consuming oil like nobody's business, even though that was apparently fixed. Losing coolant too. Some electrical gremlins as well. The list is quite long.

Edited 10 April10 Apr by davegr

Sadly common issues with some VW Group / Skoda TDI,s. ? Who was the Oil consumption fixed without an engine rebuild. Or were the Engine Numbers ever checked that it was the original engine?

4 minutes ago, Evolution13 said:

Sadly common issues with some VW Group / Skoda TDI,s. ? Who was the Oil consumption fixed without an engine rebuild. Or were the Engine Numbers ever checked that it was the original engine?

The oil consumption was thought to be leaking turbo seals but a turbo replacement hasn't changed it much, if at all. I'm not even sure the turbo could explain 500ml every 150 miles tbh. I know there's no leak. It's irrelevant now anyway, as it's the end of the road for this car, at least as far as I'm concerned.