Home > Maintenance & Mods (L322) > What to do if your DPF is blocked... |
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DrRob Member Since: 16 Apr 2015 Location: Petersfield, Hampshire Posts: 4304 |
It was working properly by looks of it. We have a saying "if it isn't broke, don't fix" Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
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25th May 2023 7:03am |
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SpitfireS Member Since: 10 Jun 2019 Location: Mainz Posts: 109 |
Yes, they readout and reset the dpf in the ecu, they use a Bosch OBDII system.
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25th May 2023 7:20am |
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SpitfireS Member Since: 10 Jun 2019 Location: Mainz Posts: 109 |
Ok, I'll bite In principle the dpf will fill up with ash over time, no matter how you look at it. The ash will not be removed by any regeneration process. So at some point it will be full. Then what? Would you say it's broken? You're gonna buy a complete new exhaust? Is your oil filter broken when it's exchanged when the ECU tells you to? 2012 4.4TDV8 2000 Honda S2000 |
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25th May 2023 7:26am |
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3245 |
Ash build-up is a given and ultimately governs the life of the DPF before replacement or cleaning. Mostly the DPF will go big miles /km before this happens unless you are using the wrong oil. If you think your issue is ash build-up and it needs another clean then I would suggest either the previous cleaning process was not effective or it's not an ash build-up issue. 2012 TDV8 Vogue (L322) |
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25th May 2023 7:40am |
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DrRob Member Since: 16 Apr 2015 Location: Petersfield, Hampshire Posts: 4304 |
Fair point on the ash
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25th May 2023 8:27am |
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SpitfireS Member Since: 10 Jun 2019 Location: Mainz Posts: 109 |
As long as the car has been mine it had the proper C1 (sulfated ash content lower than 0.5%) 5W-30 oil in it, definitely during the last 80.000km. And it was during those last 80k km it filled up the dpf with 3 times the amount of ash/dirt/whatever as it did the the previous 132k km. Going by the pressure difference test, the first cleaning after 132k km was effective, unless 5mbar pressure difference is still (way) too much. What's the pressure difference on a new OEM dpf? Maybe it has to do with the ITG air filters? They are foam filters with 'sticky oil'. 2012 4.4TDV8 2000 Honda S2000 |
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25th May 2023 3:02pm |
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3245 |
The LR workshop just states different voltages for different RPM's on the differential pressure sensor and not an actual pressure. Even a brand new DPF will throw up warning lights if you do a lot of short trips that don't allow a full regen. Doubt it's anything to do with the air filters ( although I wouldn't use them as the filtration is poor) and you have obviously looked after it with oil changes of the correct type of oil. 2012 TDV8 Vogue (L322) |
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25th May 2023 5:49pm |
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SpitfireS Member Since: 10 Jun 2019 Location: Mainz Posts: 109 |
Could you check your LR workshop manual?
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25th May 2023 7:17pm |
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SpitfireS Member Since: 10 Jun 2019 Location: Mainz Posts: 109 |
Short update: no pressure differential sensor value, unfortunately.
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31st May 2023 9:03am |
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AdrianL322 Member Since: 06 Sep 2022 Location: Ås Posts: 15 |
This is truly an encyclopedia for DPF's, thanks for all the information.
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26th Jun 2023 10:53am |
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matthews Member Since: 09 Aug 2016 Location: Leeds Posts: 99 |
Just a quick question re the dpf pressure sensor , if you unplug it does it need recalibrating after you plug it back in ? |
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29th Oct 2023 4:51pm |
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Range Rover L322 Member Since: 03 Sep 2019 Location: South West Posts: 329 |
"Just a quick question re the dpf pressure sensor , if you unplug it does it need recalibrating after you plug it back in ?"
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29th Oct 2023 10:17pm |
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3245 |
This is suspicious as it's seems too low for that mileage. If someone has done a DPF reset the soot calculations will be wrong and it could be filling up i.e differential pressure increasing at a faster rate than expected. 2012 TDV8 Vogue (L322) |
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30th Oct 2023 7:50am |
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Chel322 Member Since: 06 Mar 2024 Location: Lymington Posts: 5 |
Morning all,
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6th Mar 2024 7:10am |
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