I've no reason to suspect I've an issue, but I was curious about the status of the DPF as I've never seen a warning about it in the ~2 years I've owned the car...

Click image to enlarge

It is a gigantic topic. This post will give you a solid understanding although if you don't have an issue, I would not bother!


https://www.fullfatrr.com/forum/topic48068.html?highlight=dpf 2012 L322 4.4 TDV8 AB low mileage - a peach
1986 V8 Defender 90 County ex-Swiss Army - Red everything....

My preferred Independent: Roy Hardy. R & B AUTOS LTD, 20 Brook Road, Wimborne, Dorset, BH21 2BH 07500 866775‬ (Ex LR Chief Technician)

As above, no amber or red light then don't go down the rabbit hole
Most of the fields you've chosen there are no use at all.
Oil dilution is one to look for.
Read the thread highlighted and you'll wish you never bought a DPF fitted car  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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I'm getting *very* strong, "if it ain't broke, don't try to fix it" vibes and you guys are usually right so...

I'm not even going to read that topic haha

The DPF is a filter.
IMO, to say "if it ain't broke, don't try to fix it" when it comes to a filter is not the right thing to do.
Just add the word 'oil' or 'air' in front of 'filter' and see if you get the same reactions.
Most likely not and rightfully so.

Sure, you can drive and drive and drive and think everything is ok as long as I don't get any warnings.
Kinda like sticking your head in the soot

Every filter will be full at some point.
To replace an oil or air filter is easy and cheap.
To replace a DPF may be easy, I mean, how many bolts to undo to remove the exhaust system, but it will not be cheap.

 2012 4.4TDV8
2000 Honda S2000

The DPF is self cleaning so it's not at all like an oil or air filter. 2012 TDV8 Vogue (L322)

Quote:

JayGee Posted on 20th Jun 2023 11:15am
"The DPF is self cleaning so it's not at all like an oil or air filter."

Well... yes, but actually no.

The regeneration cycle turns the soot into ash, so yes it removes the soot.
The ash stays in the filter though, no on-board regeneration is able to remove the ash.
Lets say, for arguments sake, the ratio of soot to ash is 100:1
A 100% full-with-soot DPF will turn into a 1% full-with-ash DPF.
This means the DPF can hold only 99% soot.
During the next regeneration this 99% soot is turned into 1% ash again.
Now the DPF has 2% ash and can hold 98% soot.
And so on and so on and so on...

At some point the DPF will be full enough with ash for the ECU to say "It's done"
And then it gets expensive.  2012 4.4TDV8
2000 Honda S2000

SpitfireS wrote:

The DPF is a filter.
IMO, to say "if it ain't broke, don't try to fix it" when it comes to a filter is not the right thing to do.

Agreed but only if you get an amber or red warning should you worry. Otherwise, drive it and enjoy it  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
--------------------------------------------------

SpitfireS wrote:

At some point the DPF will be full enough with ash for the ECU to say "It's done"
And then it gets expensive.

And then just cut it out, blank and map out the EGR. Then, remap it and move on  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
--------------------------------------------------

SpitfireS wrote:

Quote:

JayGee Posted on 20th Jun 2023 11:15am
"The DPF is self cleaning so it's not at all like an oil or air filter."

Well... yes, but actually no.

The regeneration cycle turns the soot into ash, so yes it removes the soot.
The ash stays in the filter though, no on-board regeneration is able to remove the ash.
Lets say, for arguments sake, the ratio of soot to ash is 100:1
A 100% full-with-soot DPF will turn into a 1% full-with-ash DPF.
This means the DPF can hold only 99% soot.
During the next regeneration this 99% soot is turned into 1% ash again.
Now the DPF has 2% ash and can hold 98% soot.
And so on and so on and so on...

At some point the DPF will be full enough with ash for the ECU to say "It's done"
And then it gets expensive.

DrRob wrote:

SpitfireS wrote:

At some point the DPF will be full enough with ash for the ECU to say "It's done"
And then it gets expensive.

And then just cut it out, blank and map out the EGR. Then, remap it and move on

until the MOT inspector fails it.  2012 TDV8 Vogue (L322)

JayGee wrote:

That will be at very high miles unless you have another fault so again it's nothing like an air or oil filter. It's more like any other component which will wear out in time such as a gearbox or shock absorber or wheel bearing....

Imho: no.
Besides, what's high miles in your opinion?
When you drive 120.000km with a DPF it will fill up with ash and there is no other fault needed for this to happen.
And one can be sure it will happen earlier if you drive only short distances and/or city miles.

If one plans to keep the car for a while, cleaning the DPF off-board, so to speak, is IMO part of routine maintenance.
It's what you get driving a car with a DPF, it's something they don't mention when you buy the car.
That this is a 4 year routine - in my case - doesn't mean it's not a routine.

And I don't plan to change my gearbox ever, to be honest.
Especially not after having it flushed at 130.000, also something Landrover doesn't mention but ZF does recommend.
The air (front) springs probably need replacing in 10 years (as mentioned by many on this forum) or maybe wheel bearings if an alignment shows they are done.
AFAIK my 11 year 215000km old shock absorbers are fine.

 2012 4.4TDV8
2000 Honda S2000

DrRob wrote:

SpitfireS wrote:

The DPF is a filter.
IMO, to say "if it ain't broke, don't try to fix it" when it comes to a filter is not the right thing to do.

Agreed but only if you get an amber or red warning should you worry. Otherwise, drive it and enjoy it

You sound like that guy that jumped out of a 50 story building.
People could hear him say at floor 15, as he rushed by: "So far so good!"
Passing floor 5 he got the amber warning
Passing floor 3 he got a red warning

Time to open the parachute, right?

 2012 4.4TDV8
2000 Honda S2000

I know a guy with 350,000miles on the 4.4 diesel, he's never had to replace the DPF but he has had a new gearbox and several sets of shocks, among other things... maybe it's the way he drives... Pete
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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
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