Well after having had a good week with no issues, went on a 50 mile motorway trip today. Soot level raised from 15 to 19.1 over 110 miles (90% motorway).

There is no regen taking place at all now. Exhaust Temps do not rise over 300 degrees and soot levels are not going down. The only fault I had was an open fan circuit (poss affecting temps?) fans were audible at times while at 70 on the motorway.

There is obviously no diesel being squirted in to raise the exhaust burn temps. I am also getting really good mpg figures, at least 2-3 mpg more than normal. However I have noticed a strong diesel smell from the front when parking up and switching off.

Anyone know the process/sensors/instruments which initiate the diesel inject? My diesel in oil level is 0.08 (%) so not an issue AFAIK.

Thoughts anyone? (GGDR et al?)

The requirements for a regen are not set in stone. 19.6g is often the threshold that triggers a regen. Do not worry. 15 to 19.1 without a regen is absolutely no problem at all and perfectly normal.
L322s will happily sit around 20, 21, 22, 23 grams indefinitely - as long as most of your trips are more than about 4 miles (preferably more than about 10 miles is ideal) you will be fine. You dont need to be on a motorway, just going along. Mine regenned earlier on a cold engine 23g down to 20g in slow traffic over about 6 miles.

People seem to often get spooked that they have anything greater than 17g. My car runs forever at 20-23g until I go on a motorway. I drive it for weeks on end not on the motorway.

Other considerations:
1) The active regen frequency increases as you get closer to 23g. It begins to ignore speed requirements and will regen at pretty much any speed - not a full massive regen down to 3g but it will keep regenning to keep you off a Yellow Light.

2) Make sure you have greater than 1/4 tank of fuel. Less than that and the active regen may not initiate.

3) Basically don't worry unless you get a Yellow Warning Light.

I hope that helps. I spent months solving this.



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I think its working fine. It will rise on a run. No regen because it didnt need it etc. 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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Having an IID can drive you loopy  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 L322 and Dr rob.

Haven’t used the car at all since the post but have a motorway trip planned for Thursday so will update.

Also noticed in GGDR’s posts about his dirty MAF poss hindering a regen so will check cleanliness before.

@L322, thanks for the interesting info on soot levels - the LR MD service technician (in who I have no faith anyway) wanted to charge me £180 + vat just for plugging in and looking at the codes they also said they wouldn’t touch a regen on a car with a level of 23 or over

Thank God for some real expertise on here!