I Have a 2011 TDV8 with only 47K on the clock. On a trip the other day I got a red DPF warning and instant limp mode, this after travelling half way up the M1 and back the day before. Fortunately I keep my GAP tool in the glove box so managed to do a partial regen and get it out of limp mode to finish the journey.

A few days later I did a DPF clean and an almost full regen (before I ran out of road) and watched the soot level get down to 0.3grams which I thought was good enough so returned home doing about 60mph all the way for about 40 minutes.

I then checked to soot level when I got home only to find it was back up to 17.6grams.

I did a smoke test which found no leaks and the only error code I have had for years is "Heated O2 sensor heating circuit open circuit" which I'm guessing only operates when the exhaust is cold.

Is this a normal rate of soot accumulation or am I getting paranoid in my old age? 2011 4.4 TDV8 Vogue SE
1993 Discovery 1 3.5 V8i

Soot building up way, way too fast. Probably a good idea to get the sensor replaced ( or check the wiring) to rule this out. Is your mpg normal ? 2012 TDV8 Vogue (L322)

Was the smoke test high enough pressure ?
It will be an intake air leak somewhere,

4 short doughnut hoses
Throttle body hose,
Split in plastic inlet manifold ( either side ) or donought.
Look out for sooty oil deposits.

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

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Last edited by Phoenix on 23rd Dec 2023 10:05pm. Edited 1 time in total

Quote:

Was the smoke test high enough pressure ?
It will be an intake air leak somewhere,

4 short doughnut hoses
Throttle body hose,
Split in plastic inlet manifold ( either side ) or donought.
Look out for sooty oil deposits.

Mike.

Quote:

Could also be a pressure sensor, or differential pressure sensor giving incorrect values if it went straight to 'full'. Check the sampling pipes and hoses for leaks and condensation, if theres moisture in the differential pressure sensor, it will need replacing. Check all actual values at key on, engine off. They should be very close to barometric pressure, the differential pressure sensor should read zero, plus or minus no more than 2kPa.
You also need to get the O2 sensor sorted, that will be skewing all sorts of values -the heater is an integral part of the sensor for liberating free oxygen in the exhaust gases, it functions all the time, not just at cold start.

If you go to the WIKI section there are lots of technical docs inc wiring diagrams and workshop manuals. 2012 TDV8 Vogue (L322)

Quote:

If you go to the WIKI section there are lots of technical docs inc wiring diagrams and workshop manuals.

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Last edited by Phoenix on 23rd Dec 2023 10:06pm. Edited 1 time in total

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O2 sensor wiring is usually about 3-400mm long, just follow it to the engine harness.

Well I've finally changed the O2 sensor and cleared the fault code which hasn't come back.

One thing I did notice on a test run while monitoring the live calculated soot value is that when I floor it briefly to bring in the second turbo the soot values start rising very quickly and continue to do so for a while after.

I wonder if that may be something to do with not having the oil drain mod but I never see smoke from the exhaust. 2011 4.4 TDV8 Vogue SE
1993 Discovery 1 3.5 V8i