Firstly, welcome to the forum, you are amongst 4.4 tdV8 friends on here with plenty of experience between us.

My advice would start with recommending you to invest in a GAP iid tool.
It will save you hundreds in the long term and with a bit of help from the forum will point you towards most common faults.,

They appear in the for sale section occasionally, but sell very quickly, guaranteeing you a ready market should you ever sell your FFRR.
Mike G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

Thanks Mike
I will have a look around for a diagnostic tool.
I'm fortunate that a friend of mine can probably do the diagnostics but it seems that interpreting them can sometimes be the challenge

If you were hazarding a guess would you think I was on the right lines with replacing the 4 inlet hoses? It's not a huge expense and hence no problem at all if it doesn't cure the issue ..... I have uploaded a couple of photos and there doesn't seem to be a problem but then again I haven't yet looked under the clamps
Cheers
Neil

Firstly, welcome.
It would be a good idea to stick the kettle on, find the voluminous thread that goes into microscopic detail regards the dpf system as Mike and a few others have taken their knowledge to the nth degree . The info here is second to none tbh. You're probably on the right track though

It could be a late night for me  2011 TDV8 4.4 Vogue SE

I usually recommend wiping around all the pipes with a clean white tissue / kitchen roll paper, looking for sooty oil leaks, but I have just seen your pictures and at first glance they look nice and dry, so next suspect would be the throttle body hose being loose.
Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

100% recommend Henshall Engineering close to you. Old skool but they will find the issue quickly for you.
Family friend had a DPF issue. James Henshall fixed it first time.  Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
2025MY Defender D350 90 in Silicon Silver on coils
1974 Series 3 Lightweight = "Millie"
Many, many other Landies over the years
My preferred specialist: www.glenrands.co.uk
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Thanks again Mike
I think you could be on to something here
Throttle body hose looks very sooty and also a fair bit of play. I'm not sure if any play at all is acceptable tbh but I reckon I am getting about 3mm lateral movement and similar North to South

What is the usual fix? New hose or just renew the circular clip?
Many thanks
Neil

Click image to enlarge

Just pull out the wire clip and pull the hose off to wipe it clean, then bend the clip carefully to add more tension before re-fitting. Very common fault.
Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

Thanks DrRob
I will look them up and give them a call if I can't solve it pretty quickly. Unfortunately I haven't got the time at the minute to run through all the possibilities so it looks likely I could be crying down the phone to them fairly soon
I hope that Mike has identified the problem though ..... fingers crossed  2011 TDV8 4.4 Vogue SE

Thanks Mike
I'll try it first thing in the morning  2011 TDV8 4.4 Vogue SE

IID tool for sale over on D3...

https://www.disco3.co.uk/forum/sale-sale-i...c50b883c60

Thanks for the heads up Appreciate it 2011 TDV8 4.4 Vogue SE

Get the IID tool, run a scan and report back. Everything else is a stab in the dark but likley short trips over a long time will generate a DPF full light. Needs long sustained 50mph + to initiate a DPF cleaning cycle rather than a short blast. 2012 TDV8 Vogue (L322)

UPDATE
Removed throttle body hose and plastic retainer ..... cleaned it all up, including the sensor
Adjusted the circular clip to tighten the fit and reassembled.

Managed to get the fit a bit tighter but not sure whether it may loosen again in time ...... considered using an XL jubilee clip but have left it for now as haven't decided if it is feasible

Took the vehicle for a run ..... DPF amber light / Restricted Performance Warning light both gone out ..... So far so good!

Will fill it with fuel tomorrow and give it a motorway run to force a regen hopefully and give it a proper test,
Then it's off for a fault check. Yeah, I know it's a bit cart before horse
Thanks for all the help
Neil

Click image to enlarge