Hi I'm new on here and not very engine savvy

 

I have a 2019 skoda octavia taxi it's got 156364 miles on   had it from 19000 miles serviced every 10 k 

 

Last 2 months had a problem with emmisons engine light 

 

Was saying nox sensor so mechanic changed 

 

Light came on again 

 

I had it fully carbon cleaned a month ago and it was saying exhaust pressure switch so had that changed 

 

It's been on 5 times now in last month usually when I do a mway or bypass run 

 

It's saying exhaust pressure sensor again . Mechanic says he's no clue now and I'm losing the will 

 

Any ideas , thanks in advance 

oh heck...potential parts cannon alert.

 

Firstly, its best to find somebody close with either an ODBEleven dongle or VCDS. 

Get a proper scan done on the car - lets find out what its not happy with.  With Octavia Taxis (going by your biog - is it a TDI1.6), they need the occasional good/long/fast run to keep them good.  We are talking about a blast down to Preston and back down the M6.  Take it out...put some heat into the exhaust - let the re-gen complete and take it from there.  Suggest once a week (you do a long trip) to keep the engine happy.

Hi it does get a good run weekly it got a Lancaster to windermere and back yesterday,  I'll get another diag thanks 

My guess is it hasn't been allowed to complete enough DPF regenerations and is now becoming blocked.  When you say "fully carbon cleaned" do you know what that means?  Was that the DPF or some other part of the engine?   At 156k it could be a new DPF time.  They don't last forever.

On 03/06/2024 at 13:32, MarkyG82 said:

My guess is it hasn't been allowed to complete enough DPF regenerations and is now becoming blocked.  When you say "fully carbon cleaned" do you know what that means?  Was that the DPF or some other part of the engine?   At 156k it could be a new DPF time.  They don't last forever.

 

Yes, they don't last forever.
But, as example: my friend's old Seat Exeo 2.0TDI still is running fine with original DPF and car have more that 300k km on clock.
And this DPF have never been dismantled and cleaned/burned in workshop.
But he is using only one of the best fuel we can get here in Latvia- Neste ProDiesel.

Older DPFs are known to be more resilient than later versions. My old Octavia was fine for regens but a colleagues one that is 4-5 years newer is always struggling to complete even when driven for long journeys. He's had it from 1 year old so really shouldn't be from the previous owner.

The Huge Elephant in the room is these high miles / km Euro 5,s when the cheaters VW Group / Skoda / SEAT / Audi had 1.6 TDI CR,s with Defeat Devices / Software that they could not get away with as Euro 6 came in.  They planned on, but they were caught out. 

They had to release cars with new engine management before going to also AdBlue, then discontinuing some. 

 

So up to late 2015, then 2016 on are totally different kettles of fish or cans of worms.