2012 cayenne DPF wont regen

[Gazc2]

So my mate has just replaced all the injectors on his 3.0D which is now running smoothly but now in limp mode and getting a DPF error light anyone had similar issues? Weknow the dpf might need a clean however anything else to check before he goes down this route?

 

[kas750]

I'm pretty sure you can force a regen with the icarsoft ?

 

[Gazc2]

We have tried an icarsoft and an Autel couldnt get either to work.

 

[kas750]

We have tried an icarsoft and an Autel couldnt get either to work.

Oh *****!..I know it comes up in the menu when i've looked on mine.
Looks like you need someone with PIWIS

 

[jonttt]

I've done it with SWMBO Range Rover due to constant short runs, the move from DPF warning to 'visit dealer and drop you pants to pay £2k+ for a new one" is obviously programmed to be a much shorter timescale than a female can be bothered to tell you :roll:

May be totally different with porsche but for Range Rover once the DPF has registered >100% full and the red visit dealer warning it will not perform a regen even if forced by diagnostics. Even Range Rovber dealers cannot force one. The only way to fix the problem officially is fit a new DPF :wack: .......the normal fix is to remove the DPF and let a specialist cleaning company clean it and refit, obviously cheaper than new but still expensive. Then the mobile mechanics found a 'hack" (obviously due to the demand and some make a living just form doing these). The hack is to remove the DPF pressure sensor input (to the DPF) tube (which is usually wider than the output tube) and hand pump 2.5 litres of DPF cleaning fluid into it, let dwell for 30 min. Whilst waiting use a diagnostic (ICarsoft for Range Rover will do it) to 'replace the DPF" and reset the soot readings. You then have to remember to actually clear the fault code and that allows the car to run as normal ie out of limp mode and regen. Give the car 5 min at 2.5k revs, watch all the ash and fluid get ejected (don't have washing near). Then take for a run and force a regen with the diagnostic........you will get smoke for 15 min but then 0% soot, no warnings and a clean DPF good to go.

If it's relevant at all to give you an idea here is the Range Rover how to video I used....... I would guess there is a similar process for Porsche :thumb:

https://youtu.be/11vmCOm40Pk

PS depending on model if access is easier via the Ad Blue injector that is preferred as you can also clean the Ad blu injector if its started to crystallise ......basically easiest way you can get the cleaning fluid into the DPF without actually removing it...... :wink:

 

[Gazc2]

I suspect thats where were heading Jontt taking it off for a clean, or possibbly fitting one of these https://www.darksidedevelopments.co...ete-downpipe-for-porsche-cayenne-3-0-tdi.html followed by dpf delete coding and a re-map no ad-blue on this model.

 

[deMort]

I can't say for certain this model is included but most diesel injectors i've replaced need to be coded to the car .. there are some numbers on each injector which the car needs to be told .

if the car wasn't in limp mode before the injector replacement but is after then i would lean towards this .

The car will not do a regen if there is a fault code that's relevant and certainly not if in limp mode .

Piwis tester can do a forced regen if below 65 grams .. above that and it's a manual clean to have any chance .

If a fault code though or limp mode i would not advise doing a forced regen .

 

[Gazc2]

Thanks Ian its going in to have a DPF clean and the injectors coded so hopefully that will sort it 👍