- 204ps Bi-Turbo CXEB T6 Engine & Turbo problems -

So update from me....

Turbo replaced by Retro Resus and have since done 1700 miles. While it appeared the van wasn't using oil for a while, oil lights come on inidicting it's used about 1ltr in that time. Back on the phone to RR in the morning I guess.....

So vans back at RR, they've asked for it for the week... their initial view om arrival is to redo compression test, then diagnose from there.... see what they say in the next 24/48 hours.

Vans picked up a few issues in the last month as well...

1. Stalling on occasion
2. Flashing coil on startup on 3 occasions followed by intermittent stalling.

Retro Resus intermate glow plug 3, MAP sensor and crank speed sensor need replacing from reading codes. Seems odd for 3 faults developing over a short window so any opinions welcome!

Current codes logged are as follows:

Year: 2018

Body type: VAN

Engine: CXEB

Mileage: 127540 KM
---------------------------------------------------------------

01 Engine

System description: R4 2.0l BTD

Software number: 04L906056KQ

Software version: 3775

Hardware number: 04L907445A

Hardware version: H03

ODX name: EV_ECM20BTD03004L906056KQ

ODX version: 004004

Long coding: 00254014432401080000

Trouble codes:

P010300 - Mass or Volume Air Flow Sensor "A" Circuit High

Intermittent

P032200 - Ign./Distributor Eng.Speed Inp.Circ. No Signal

Intermittent

P029900 - Turbo/Super Charger Underboost

Intermittent

P029900 - Turbo/Super Charger Underboost

Intermittent

P305400 - Starter does not turn Mechanically blocked or electrical malfunction

Intermittent
(This one's new from this morning, seemed to appear alongside flashing coil on dash, engine on and off a few times stopped flashing coil on dash)
 
So vans back at RR, they've asked for it for the week... their initial view om arrival is to redo compression test, then diagnose from there.... see what they say in the next 24/48 hours.

Vans picked up a few issues in the last month as well...

1. Stalling on occasion
2. Flashing coil on startup on 3 occasions followed by intermittent stalling.

Retro Resus intermate glow plug 3, MAP sensor and crank speed sensor need replacing from reading codes. Seems odd for 3 faults developing over a short window so any opinions welcome!

Current codes logged are as follows:

Year: 2018

Body type: VAN

Engine: CXEB

Mileage: 127540 KM
---------------------------------------------------------------

01 Engine

System description: R4 2.0l BTD

Software number: 04L906056KQ

Software version: 3775

Hardware number: 04L907445A

Hardware version: H03

ODX name: EV_ECM20BTD03004L906056KQ

ODX version: 004004

Long coding: 00254014432401080000

Trouble codes:

P010300 - Mass or Volume Air Flow Sensor "A" Circuit High

Intermittent

P032200 - Ign./Distributor Eng.Speed Inp.Circ. No Signal

Intermittent

P029900 - Turbo/Super Charger Underboost

Intermittent

P029900 - Turbo/Super Charger Underboost

Intermittent

P305400 - Starter does not turn Mechanically blocked or electrical malfunction

Intermittent
(This one's new from this morning, seemed to appear alongside flashing coil on dash, engine on and off a few times stopped flashing coil on dash)
Going to assume you're the 'other' owner that had a BorgWarner turbo from them that has gone wrong recently?
 
Going to assume you're the 'other' owner that had a BorgWarner turbo from them that has gone wrong recently?

No thats not me. Curious on your issue and story to date though.

For me, turbo seems to be doing its job properlu as no oil out the back of it anymore, but feel like it might not have needed replacing as was performing fine. Expensive replacement if not!

No definitive answer on what the issue is but deemed to be engine woes even though compression tests were still ok the second time.. given a quote for £6.3k for a rebuild...

Had the rocker cover replaced in line with other guidance on the general issues (this woukd be part of a rebuild anyway) along with a string of electrical issues that had popped up (map sensor, crankshaft position sensor, all 4 spark plugs but only no3 was faulty). Juries out if this will fix my issue though.
 
List of CXEB members effected.

@Tourershine - New Bi-turbo, DPF,

@RunDSG 2017 - New Bi-turbo, DPF,

@Dellmassive 2018 -- New Long Block Engine, DPF, CAT, Lamda sensor, + ( New Turbo, not needed but fitted anyway)

@robbidoo - New Bi-turbo,

@Andnik - - New Bi-turbo,

@Malcs - - New Bi-turbo,

@MikeyBeeT6 - New Bi-turbo,?

@Sparkyis - New Bi-turbo,, DPF, CAT, Lamda sensor,

@WinFreak - New Bi-turbo, DPF, CAT, Lamda sensor,

@Deleted Member - - New Long Block Engine, DPF, CAT, Lamda sensor,

@Steve8n9 - New Long Block Engine, DPF, CAT, Lamda sensor,

@driftingaway - New Long Block Engine, DPF, CAT, Lamda sensor,

@boxbark - New Long Block Engine,

@WolvesVW 2017 - New Long Block Engine, DPF, CAT, Lamda sensor, ( + DMF ) ( Turbo recond)

@vww - ?

@lexhorton 2017 - Turbo?

@Jonp40210 - new turbo?

@bp_porcaro - 2016 204 DSG diagnosed with low compression (17 bar) and oil use about 1 ltr every 1700 miles. Not fixed yet. Quick update on my 2016 204 ...82000 mls. After further work / investigation it appears that the small turbo is / has been the main culprit for my high oil consumption. Observed when the charge cooler was being replaced. Now booked in for new biTurbo unit. Not even thinking about the high bill because it makes me cry

@UVW_T6 - 2017 - new turbo, EGR blanked, DPF removed, mapped to delete DPF, EGR, AdBlue and Stage 1 boost.

@t6stormer - new BI Turbo but still in limp mode ongoing issues

@Deansie - high oil use - snapped shaft on small turbo. possible blocked DPF/CAT.

@Repete - MY18 204hp CXEB, 135000km, Oil weighing done by VW. Outcome is 0,7 liter/1000km.Now anxiously awaiting kulance claim response from VW.

@albiro - 62,000 miles (100,000km), and the oil consumption is measuring at 0.6 litres per 1000km, above VW's threshold of 0.5 litres per 1000km.

@Heydave - 0.4l per 1000km

@RS6plusMTM - 2017 CXEB 65k - small turbo seized solid - replacement turbo and had DPF professional cleaned as a precaution, even though it had no signs of excessive soot. Compression test perfect and no signs of any high oil usage.

@gavbarlow - add mine to the list too. 2017 CXEB, 102k miles. (unsure if turbo or block atm)

@merdoklt - mine had turbo fail at 100k, now at 108k it is consuming 0.4-0.8L of oil per 600mi. Looks like I might have worn out piston rings, etc. Here is a good write up in German about what might be causing the 150kw (edit: 204ps) engines to fail - T6-Motorschaden

@thebuzz555 - I’m at about 1L every 1k, already had consumption test done by VW which it passed, it’ll be getting traded back in to them for a 150 soon

@UVW_T6 -
've also had turbo issues, started squealing and then dropped all power - at only 50K miles (which I think is quite low for turbo failure! :eek:)
204 CXEB MY17(67). Had a new turbo, EGR blanked, DPF removed, mapped to delete DPF, EGR, AdBlue and Stage 1 boost..

@Ashypants -
I think I’m heading the same way…started using about 800ml per 1000miles at moment. Van starting to feel sluggish - got a ‘dead spot’ around 1200rpm. Tried running some injector cleaner through but not sorted dead spot. Think I’ve prob got a few problems going on - high oil usage (engine or turbo) and possibly DMF. Caravelle 2.0 204 BiTDI standard no remap etc. 93500miles.

@t6stormer - new BI Turbo but still in limp mode ongoing issues,
Bought from vanstation (wouldnt buy a wheel barrow from them again) 2017 t6 204bhp 76k miles.within 100 miles limp mode and diagnosed as small turbo snapped shaft, and bits gone into large turbo and damaged that too. turbo removed sent to turbo technics who couldnt do it no parts, however midland turbo repaired it £971. new turbo fitted goes well, however within a week limp mode again, also noticed no boost below 2000rpm. now it looks although its had an adblue delete and this wont allow the limp mode faults to show on vcds or on the van. I've no idea of the history of the van and dont know if its had an egr delete too? so im stuck now trying to diagnose my fault with no error codes. the adblue has 3 lines showing instead of miles, i have filled the tank with 8 liters of add blue but no difference, van still runs but shows no miles
have been advised it could well be deleted. Update on the latest software. Van was taken in and flashed with the latest software, I was hoping on the way home it would go into limp mode and flash up a warning light. However strangely enough it drove home with no problems at all, even had the ad blue showing 6.5k miles. Driven a few miles this afternoon a bit more spirited and still no problems. Im going to keep an eye on this as it did the same after the new turbo, ran well but limp mode after a week. Hopefully now when it does go into limp mode it will show an error code and i can work from there.

@ragnar.sabo - Mine is using more than 0,5 liter pr 1000 km. The turbo faild in july.

@Lolo77 - 2019 T30 204 PS 2.0 TDI bi turbo engine failure. engine failure due to low cylinder compression. Van started running lumpy in low gears, then came the exhaust smoke, immediately stopped driving, P100400 fault on diagnostics, pointing to cylinder 1, replaced but same problem so had recovered to VW approved who has simply said needs a new engine. Aware of the EGR issues and although out of warranty the van has only done 50k miles. Quoted £20k.

@Mart Ini - New twin turbo for me, amongst other very exensive stuff...new inlet manifold with valves cleaned using walnut shells, there was so much carbon build up despite using premium fuel and regualr high revs motorway runs to try and avoid this. There was no high oil useage though, jsut a rattling coming from the turbo, engine light on, no low boost pressure, fine with a few revs through it though but not driveable iuntil it was fixed. 2018 T6 Kombi Highline 204 DSG

@Repete - Another patient joining the high oil use "club". MY18 204hp CXEB. 135000km. Oil weighing done by VW. Outcome is 0,7 liter/1000km.
his week, time had come for my van going in to get the work included in TPI 2061290/6 done. As mentioned earlier we landed the following deal:
VW offering a 80% discount on all parts regarding the TPI. The danish distributor/VW shop agreed to a 50% discount on all work.
The work started Tuesday morning and final stuff finished slightly past midday today (Friday). Had them do the cambelt kit now while at it (139800 km)
So now fitted with
- a new base engine (03N100090AX) (stated as shortblock with cylinder head and all that goes with that)
- fresh Diesel particulate filter
- New Catalytic converter
- New Lambda probe.
- Loads of bolts, gaskets, tubes etc.
The ash level has been reset according to zero as mentioned in early posts of this thread.
Also oil pressure is set to max while running the new engine in.
After getting old engine out they found water in the EGR cooler forcing a replacement of that as well.
Haven´t driven it very long yet but immediately noticed the engine running far smoother with far less vibration.
Looking forward to spin it more to get a sense of more potential improvements.
Good to finally get fix done done and, after bleeding a not exactly small bill, hopefully getting it fully out of my "system".
Massive :) thanks to Dellmassive for creating this very informative thread here.
Has been a great help along the way.


@albiro - 2016 T6 204 CXEB . in the last couple of years the oil consumption has gone pretty high and I just had an oil consumption test done and it's pretty bad news. The van has done 62,000 miles (100,000km), and the oil consumption is measuring at 0.6 litres per 1000km, above VW's threshold of 0.5 litres per 1000km. The VW dealership are recommending a new engine, and they've quoted me £17,800 for parts, labour and VAT. The quote I've got back lists £7871.00 for a "stock base engine (long block)", £1440.00 for a Catalytic converter, £1845.00 for a diesel particulate filter and £295 for a lambda sensor, then there's a further three pages worth of odds and sods like washers, gaskets, bolts, etc. The labour is quote at £2070.00. All the prices then need VAT adding on, on top of that. After a month of going back and forth with VW, they eventually agreed to supply the replacement engine at warranty price, and contributed 30% towards the job. In total the van had a new longblock engine, DPF, catalytic converter and lambda sensor fit at the end of December, coming in at £8,750.00 including labour and VAT. I've put the van up for sale (I don't have sufficient privileges to post on the for sale page on the forum). The overall job original estimate was £17.8k inc VAT, VW agreed to supply the parts at warranty price rather than retail which brought the job cost down to around ~£12k, and VW contributed 30% (so ~£3k) and I paid £8.7k.

@Martymuffin - What, so 1Ltr of oil after 1,500 miles is not good…Yup, I am another one. 204 DSG (2018) 4 motion 60k.

@Heydave - I think I’m also a casualty. Sportline 67 plate owned from new, currently on 37500 miles so .mainly local stop start. Noticed oil level dropped by around 0.3 l topped up reported to dealer car case seal was changed but made no difference to the oil consumption loss rate. Coil light came on and went intolimp mode. Dealer said not egr but flushed it out anyway. Started to worry after reading about the CXE engines on the forum. I’ve tried 2x 600 mile tests and used around 0.4 l each time. Although this passes I’ve booked in for a consumption test anyway as I fear that it’s the beginning of the end. My all in warranty runs out in February next year! Other issues I have noticed is a slight rattle from the engine when feathering the accelerator and sometimes a slight juddering as though it running out of fuel in low revs, and although it’s a dsg the engine has stalled twice. Not sure whether these symptoms are all related in some way. Furthermore I have had long life 2 year service plan but now concerned it’s should of had a fixed term service plan(every year) due to low mileage/ stop start

@RS6plusMTM - 2017 CXEB 65k - small turbo seized solid - replacement turbo and had DPF professional cleaned as a precaution, even though it had no signs of excessive soot. Compression test perfect and no signs of any high oil usage. Pretty sure it related to poor oil heat management of the CXEB as for me it failed after a 500+ mile, all day drive in the 40 degree French heatwave during this summer and it seized leaving it to cool over night. A month for the AA to repatriate the van back to the UK and then a further 3 months waiting for the turbo to come into stock from being on back order so only just got it back this week.

@gavbarlow - . 2017 CXEB, 102k miles.. This discussion has been very useful and has helped me to diagnose some issues with my 2017 204. It's just done 102k miles, and has been religiously serviced by VW since new. It's used daily as the work van and regularly does mixed journeys and have experienced not issues with it at all in that time. Just recently its started displaying an engine light which registered as a glow plug 2 fault and EGR flow fault. When re-setting the light, the EGR code wouldn't always come back, but figured I needed to look into it further. Over the festive break I took the opportunity to replace all four glow plugs and whipped out the EGR valve and associated pipework. The pipes had been replaced under warranty around 4 years ago as one had split causing a blowing exhaust noise, so I was hoping they would be in good order - I was wrong! The front pipe from the EGR to the inlet was nearly clogged with an oily carbon buildup that resembles toothpaste. I've now got a new EGR valve and associated fittings ready to go back on, and the bill for genuine spares alone is around £800. Having read this feed (and all the others on the topic of turbos) I've taken the decision to remove the DPF and bi-turbo while the EGR was out as it's slowly started to use more and more oil. The inlet pipes to the turbo had oil inside all of the them, the exhaust manifold was full of oily/carbon deposits, and the gasket was saturated in oil. The lower spindle has some considerable play and the top spindle feels sticky and not free spinning as it should be. A rebuilt turbo, fitting kit and a DPF clean at Darkside developments will set me back a further £1500. Yes, the job is as bad as it looks/sounds - the VAG repair instructions give you a good steer but it's not quite as straight forward to do having never done one before. I'm an experienced mechanic and restore historic vehicles for a living so I know my way around an engine bay. Even so, I found this one of the worst jobs I've done in years given the limited access and poor visibility.

@Manu - T6 (2017 204 biTDI, DSG, 4m, 60k miles) started to consume more oil than it used to. Until now I only had to add 0.5 to 1l of oil between services.... On the last long trip (around 2k miles of European motorways), it went through something like 3 litres in 2k miles!. Also got the 1000km/650 miles Adblue warning popping up despite adblue tank being full (3 times...). The warning would clear on its own after a few miles but gave a 31103 code SCR/NOX error.

@WoopsBoughtT6 - 2017. 71000 miles. CXEB engine. Burning about 0.5ltr / 1100 miles. Will be doing an oil consumption test over the next 600 mile round trip journey as I think it's drinking oil when on longer trips.

@upacs -
Thank you for the extensive info. You can count my van in the stats. I had my CXEB engine replaced late last year. Symptom was high oil usage (1L every 1500Km or so). The van was running sweet, but my garage (independent) already told me about this issue, and arranged for a replacement. Even though VW covered 80% of parts and 50% of labour, it was still a nasty bill. But I will admit, as soon as I started the engine I noticed the difference. So smooth! - Is there a way to know if my replacement CXEB engine is the revised one? just want to make sure I have a good engine now, and not another broken CXEB. For what it's worth, my garage told me he is replacing one engine on these vans per week. He posted his findings here: Büel-Garage AG (it's in German, but you can translate with Google)

@kiteboardkid -
Just had a new Bi-Turbo system fitted under warranty. 43k miles - Please add me to the list of failed Turbos on the CXEB. (new Bi-turbo fitted under ALL-IN cover)

@SAJO - Feel free to add me to the list when you get chance. Turbo failure New OEM turbo fitted by local commercial dealer. These 2 fault codes,
P00AF00 Turbocharger/Super charger Boost Control A. - Sporadic
P22D300 Turbocharger Turbo Inlet Valve Stuck Closed
Turbo sent to Turbo Technics for repair/returned Irreparable
Then new OEM turbo fitted. 2018, and 82000miles.

@









*****************************

if you have been a victim, drop a mention here and ill add you to the list:

*****************************
Hey, I may have the start of these issues with a newish can (to me) sad times) van. It’s got 97k, I’ve got someone coming to clean the DPF on Tuesday, can I ask how many people who were out of warranty were successful at getting VW to part pay for a replacement engine and labour due to all of the issues with these engines? And if so, how they did it? Hopefully won’t need it but preparing for what could be a long road ahead. So gutted I didn’t my see these posts before buying. I’ve had a 2016 caddy with the same engine (no bi turbo) and it’s been a good little van. So thought I was safe.
Thanks all.
 
Hey, I may have the start of these issues with a newish can (to me) sad times) van. It’s got 97k, I’ve got someone coming to clean the DPF on Tuesday, can I ask how many people who were out of warranty were successful at getting VW to part pay for a replacement engine and labour due to all of the issues with these engines? And if so, how they did it? Hopefully won’t need it but preparing for what could be a long road ahead. So gutted I didn’t my see these posts before buying. I’ve had a 2016 caddy with the same engine (no bi turbo) and it’s been a good little van. So thought I was safe.
Thanks all.
What's your symptoms?
 
What's your symptoms?
Almost Constant regens and had to put half a bottle of oil in it on the way back from Devon last weekend. I’ve stopped driving it for the mo and booked a DPF clean and diagnostic. Total mare, private seller… fingers crossed it will be OK but reading these posts, I’m not particularly hopeful.
 
Almost Constant regens and had to put half a bottle of oil in it on the way back from Devon last weekend. I’ve stopped driving it for the mo and booked a DPF clean and diagnostic. Total mare, private seller… fingers crossed it will be OK but reading these posts, I’m not particularly hopeful.
Do you have any advice? I’m looking out for CXEC engines just in case, are they a direct swap?
 
Do you have any advice? I’m looking out for CXEC engines just in case, are they a direct swap?
The advice is to follow the TPI guidance to identify the problem.

First confirm the 0.5L per 600k mile oil loss

Then have the compression tested.

That Indictates possible block wear or turbo,

Then boroscope to see where the oil is going.

For the cxeb could be worn block as per the tpi, or could be turbo leaking as many have had..... The turbo problem may be caused by a clogged dpf.(Back pressure causing the bearing to run dry?)
 
An oil test is a very good indicator of what's going on with your engine, soot content, wear materials and fuel dilution. VW's excessive oil loss limit is quite honestly scandalous.
Darkside Developments do an oil test kit that comes with a syringe and long tube so you can take the sample from the dip stick tube. I had both their test and a millers oils test done for comparison.
 
Thank you both, I’ll get the oil test, for the oil loss test, would you do that through VW themselves?
Yes, but if your out of warranty you may need to Authorise a £500 diagnostic fee.

If it fails the oil loss test, you move onto the next step.... IE compression test.

You might be able to talk to VW about part payment towards repair....
But they will only fit, new like for like.... IE a new version block CXEB.
 
Yes, but if your out of warranty you may need to Authorise a £500 diagnostic fee.

If it fails the oil loss test, you move onto the next step.... IE compression test.

You might be able to talk to VW about part payment towards repair....
But they will only fit, new like for like.... IE a new version block CXEB.
Ok, so I think I’ll do DPF clean, then oil test. See what those turn up then move on to VW. If they fit a new version CXEB, would it be likely to have the same issues or have they been changed?

Do you think that’s a good course of action?

I know a garage that fits a VW crate engine for around £11k all in. But guess that depends on what VW say, happy to get a solicitors letter if needs be.

Sorry for so many questions, I owe you a beer…or 10. You must get bored of this. Thank you so much for your advice.
 
11k all in for a new crate engine is a very good price..... Going by the price list I show above when I got mine done.

A NEW crate engine from VW will be the new revised version from the factory..... The block etc was revised in 2019 just before the moved over to the CXEC.

So if it's new from VW then are are fine.... But if you get a recon from anywhere else then you will have no way of knowing if you have the new version or not.... As so far knowing knows the engine serial number range that was done.

When I asked VW themselves for the new engine number.... They said the engines come blank for the original number was still valid.

A recon cxeb is a defo no from me as they may have just fitted new pistons and oversize rings..... Which I'll ultimately let you down.

The CXEC is fairly sound, so that as a replacement is a cost option that may be cheaper then a whole new long block.

Darkside developments and the reputable companies offer a genuine VW new exec as part of the repair..... And I believe they don't even was the old engine back anymore. (VW that is)
 
11k all in for a new crate engine is a very good price..... Going by the price list I show above when I got mine done.

A NEW crate engine from VW will be the new revised version from the factory..... The block etc was revised in 2019 just before the moved over to the CXEC.

So if it's new from VW then are are fine.... But if you get a recon from anywhere else then you will have no way of knowing if you have the new version or not.... As so far knowing knows the engine serial number range that was done.

When I asked VW themselves for the new engine number.... They said the engines come blank for the original number was still valid.

A recon cxeb is a defo no from me as they may have just fitted new pistons and oversize rings..... Which I'll ultimately let you down.

The CXEC is fairly sound, so that as a replacement is a cost option that may be cheaper then a whole new long block.

Darkside developments and the reputable companies offer a genuine VW new exec as part of the repair..... And I believe they don't even was the old engine back anymore. (VW that is)
Hey, thank you for all of this, where abouts is the price list you put up? I can’t find it. I’ve been back about 10-12 pages. Do you know if Inwould have to take it back to the original VW garage for the work( Wrexham) or whether any will deal with it? Do you know what the chances of getting them to contribute are?

Thanks again.
 
Here...


We finally got some paperwork from the dealers for the CXEB engine swap. . .

its 10 pages long !!!

the BiTurbo is on separate paperwork, - as i paid for that.

the DMF is on separate paperwork as that was under 24mnth parts warranty.

looking like:
£7871 Base Engine
£1845 DPF
£1440 CAT
£295 Oxygen sensor
plus all the other bits,
plus labour
plus VAT


lets take a look. . .



@Dellmassive`s T6 T32 Sportline 204 LWB DSG PV MY18 - Van Adventure
 
Hey, @Dellmassive just an update, so the DPF guy came out, couldn't do the clean due in part to some electrical errors which seem to be connected to the 5 volt supply and the start of some oil exiting the filler cap (possibly due to pressure) and the engine sounding lumpy at 2500 revs (could be to do with the electrical error now (things are obvs not going in a good direction). Its going in to VW Van Centre Coventry for a diagnostic next week, still not driving it. :oops:
 
Hey, @Dellmassive just an update, so the DPF guy came out, couldn't do the clean due in part to some electrical errors which seem to be connected to the 5 volt supply and the start of some oil exiting the filler cap (possibly due to pressure) and the engine sounding lumpy at 2500 revs (could be to do with the electrical error now (things are obvs not going in a good direction). Its going in to VW Van Centre Coventry for a diagnostic next week, still not driving it. :oops:
Ok... Keep us posted.
 
Hey, @Dellmassive just an update, so the DPF guy came out, couldn't do the clean due in part to some electrical errors which seem to be connected to the 5 volt supply and the start of some oil exiting the filler cap (possibly due to pressure) and the engine sounding lumpy at 2500 revs (could be to do with the electrical error now (things are obvs not going in a good direction). Its going in to VW Van Centre Coventry for a diagnostic next week, still not driving it. :oops:

I think I'd consider removing the DPF and cleaning it off the van, there are plenty of Youtube videos showing this.
It's hard to see how this could impact on any electrical errors as the engine won't need to be run during the process.
Obviously if you go down the route of a new engine you'll want to ensure that the DPF is functioning properly anyway.
 
I think I'd consider removing the DPF and cleaning it off the van, there are plenty of Youtube videos showing this.
It's hard to see how this could impact on any electrical errors as the engine won't need to be run during the process.
Obviously if you go down the route of a new engine you'll want to ensure that the DPF is functioning properly anyway.
I watched an interesting video on YouTube by a guy called baz meredith (also the channel name). It was titled Fix the faults and the DPF will sort itself out!!!. He was working on a Nissan at the time but the logic will be the same and he did have a T6 in the workshop too. Sure he mentioned something about electrical stuff - maybe it was just the voltage of the injectors? Anyway, a good watch if you have 17 minutes to spare.
 
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