Land Rover DPF issues

Me too.

I agree but change mine yearly at 7K dilution is checked weekly.

I feel Xtrailman that is rather a brusque reply! These are my personal experiences, and I recommend them. My 'Google' comment was to advise members they can find much information regarding this subject at that source. There is no need for rudeness.

I don't see it as being rude, there is a huge amount of misinformation on a google search, that's a  fact not rudeness.

And there is a huge amount of true information. Because you choose not to believe it and have a different opinion - to which you are entitled, as i am mine - doesn't make that information and opinion fake or invalid. My views are not only based on my own personal experience, but also those of colleagues and family in the trade, my local garage, numerous car forums i am involved with and Honest John, to name just a few of many potential sources. 

Out of the whole affair, the thing I find most worrying is that the computer said "Up yours". 

Credit to the garage to try another computer to read the situation.

makes me wonder how much we have to rely upon a technician (formally fitter) and a computer (Hal 2001) when we get a warning light up  and what authority we would have to say, try again on another machine.

rgds

DPF Update

Been off grid for a couple of weeks and just caught up on the thread.
Two weeks into our trip and the DPF filter warning light came on again despite several hundred miles of driving, with trips ranging from 30mls to 230 mls.
Land Rover Assist were called and fortunately the guy that came out seemed to know his stuff. Within a few minutes he had his diagnostic computer attached to the car and said he thought he knew the root cause of the DPF issues.
Up went the bonnet a large hose looking thing was unclipped and a finger prodded into a black box. Thought so he said and promptly fitted a new black box. Jump into the car and we can start the re-gen cycle he said.
On route the technician explained what had just happened. Firstly he said the re-gen cycle requires the system to recognise the pressure in the DPF had changed, indicating the need. Secondly a quarter of a tank of fuel must be present to ensure the cycle can be completed. A large injection fuel is then initiated to raise the temperature in the DPF high enough to burn off the soot/carbon.
At this point the problem began, the black box was in fact the throttle body and the finger prod was to check if the butterfly valve was sticking, which it was. This valve is what controls the fuel flow to ensure, among other things, the re-gen is controlled at the correct temperature within the DPF. The reason for the reasonably high speed is to provide a good air-flow over the DPF to stop it overheating. The trip lasted about 6 to 8 miles and was carried out at normal revs and about 50mph.
The technician said he was confident I would have no further issues, hope he is right, but as said above he seemed to know his stuff.
Seems very poor that Land Rover did not know how to fix my problem and claimed it was my driving style, which was based on the mileage of the car set against the age suggesting less than 10k per year. Ignoring the fact we use a smaller car for running around locally and use the LR for towing and longer journeys. I will be contacting LR for an explanation.
The up side although on a small sample is a much improved mpg return. Previously average mpg on trips without the van were about 33 with the new throttle body, the car is claiming 47mpg on tootling around Yorkshire.
I realise the car does not give 100% accurate figures, but like for like seems a good improvement.
Looking forward to the trip home to see if there is any improvement while towing.

I think you may have mis-understood what he explained to you. the throttle body regulates the engines air flow. 

Some of these LR assist guy's are quite good, My Sons car had a starting issue that the dealer couldn't sort but the second LR Assist guy who came out to it diagnosed a cam position sensor and its been fine since. 

You are correct about the airflow, and I believe that controls the air/fuel mix, that is how I understood his explanation.