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P2459 code

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Comes up as DPF regen frequency.

Does this mean the dpf is full ?

2023 Skoda Superb 2.0 Diesel 113k

Googled and this came up - its a little generic but gives a decent explanation. 113k is a massive mileage for a 2023 car - what sort of driving do you tend to do?

VW Passat is the most likely comparator - talks about a pressure sensor so I'd look at getting it scanned with something like OBDII or VCDS to see what fault codes may help point to it. Have you noticed economy taking a nosedive?

  • Author

Ive noticed the economy dropping a little but not loads ...still average 55- 60 mpg on motorways .

I use the car for work which involves driving up and down the motorway ( its mainly motorway mileage i do)

Been for a oil change today and the local garage has a code reader that measured the sut and was reading 41 but i think i could do with a specialist to get a pinpoint remedy because i dont want to be just changing sensors for the sake of it.

113k with 95% motorway miles still shouldn't clog up a dpf surely but i could be wrong.

Not compared to the what I've been reading - with the engine up to temp and more steady-state throttle its better than frequent accelerations when the car is cold. If you've got a sensor out somewhere the mixture may be rich hence increased fuel, and therefore soot. Did the garage run a diagnostic on it and see if there were any fault codes?

  • Author

Just the fault code i stated ...its not their field of expertise though ..i may have to get it checked elsewhere but the difficulty is finding a trusted garage that wont guess but find the issue.

I can see why ppl delete these tbh ...last 3 vag cars all dpf issues

Have a look for a good independent garage who specialises in ze German cars

The problem with all motorway miles is the revs are low, so a good thrashing when warm is good but that also causes more soot.

When safe to do so go on the motorway but keep it in low gear for 15 mins so the revs around 2.5k

  • Author
2 hours ago, Danoid said:

Have a look for a good independent garage who specialises in ze German cars

The problem with all motorway miles is the revs are low, so a good thrashing when warm is good but that also causes more soot.

When safe to do so go on the motorway but keep it in low gear for 15 mins so the revs around 2.5k

Just done this for 10 miles down the M1

  • 2 weeks later...
  • Author

Problem with this is there is that many things what would come under this code.

My question is this ...if i used the correct scan tool would this pinpoint where the issue is ?

For a while now ive suspected the re-gens have been happening way too often ( i do 95% motorway driving )

  • 3 weeks later...
  • Author

*Update*

I left the mil light on and it went off on its own after a few 2.5 / 3k revs down the motorway .

It still seems to regen often so will be investigating this .

In answer to your previous question, any VAG specialist would have better diagnostics but there are plenty which should give you more of an answer than a broad spectrum fault code.

What was the software/tool that gave you this code btw?

  • Author

Agree Travs...it was a basic foxwell.

I did have a Diognostic booked in however due to the snow it was cancelled.

Tbh - if you’re keeping the car for any sort of time, I’d look at an OBD11 or something like that. Should give you much more info and isn’t much cost I don’t think.

I would check for an air leak in the intake and exhaust.

This can cause the combustion to create more soot than normal and hence trigger the warning that regen frequency is too high.

Effectively the regenerations are working as intended but the DPF is filling up faster than expected.

It would require longer term monitoring but it could also be a clogged/fault delta pressure sensor giving the wrong feedback particularly if the fuel economy is still fine & didn't change.

Your driving profile should be fine for a DPF, lots of motorway mileage

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