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Which additive do you recommend Peter? I know some people are against them, but they've been around for a long time now and I think there would have been repercussions if they had any adverse effect. For the record, picked the car up yesterday with the orange DPF light on. I know it's been sat at the dealers for around 3 months and if it's been out at all it would have only been on short test runs. It also has only 52k miles on the clock so on an 09 plate that suggests it's probably been used for short journeys more often than long ones (although there were a few addresses stored in the sat nav that were quite some distance apart - Birmingham, Glasgow and Newcastle upon Tyne, and the last owner was based in W. Sussex. Anyway, I extended the motorway run home to around 50m but it didn't clear. This morning I put some Wynns DPF Cleaner in the tank and filled it up with Shell V-Plus or whatever it's called. Went on a longer run, varying the speeds from around 50 to 80 as somebody suggested earlier, pulled into the services at around 50 miles to go to the loo and when I came back and restarted it the light was off. I've done around 80 miles since, 30 of that in town, and it's OK so far.

They are valves to allow the excess air pressure inside the car to be released when you shut the boot. As you close the boot it tends to push air inside the vehicle raising the pressure and tending to prevent the boot fully closing. 🙂

Too high a pressure and you can lose both cornering and braking ability. Keep the pressures at what the handbook says. you have a different problem. If they’re all balanced, take them off and check for dents in the rims

If you are having a problem with the DPF RED warning triangle stating the DPF is full DO NOT listen to Jaguar. Please see the 3 other threads for DPF's i have added to. In a nutshell either JLR diagnostic equipment is not fit for purpose or the technicians are not experienced enough to fully understand DPF's and correctly test them. I was quoted £3993.00 to replace mine on a 10K milage car. I had it done for £90.00!! Your ECU guesses the Soot counter and Ash values in the DPF based on driving habits etc.If it gets to a certain level it will perform a passive regeneration whilst you are driving. If the journey you are doing is not long enough to get everything up to temperature to burn off the soot it will not regenerate. If this driving style continues and it does not get to do a regen it then thinks it is full and subsequently gived the dreaded FULL red warning. I took Mine to Fitch Autos who were brilliant. They did all the tests to confirm it was not full and then did a manual check with a Manometer to confirm there was actually very little soot in there. The soot counters were reset then when it was driven it performed its own regeneratin and works perfectly now. HOWEVER...it has to be checked properly. You cannot just reset the counters as this can cause a fire and serious damage. The values have to be calculated and ckecked by professionals mate.

I disagree very firmly with Paul. Additives are not expensive, nor are they snake oil. A can of a suitable additive which you will use less than once a month will cost around £10 and will assist with the DPF Regeneration. And avoid a remap, quite unnecessary, unless you want to become a boy racer. The engine which Jaguar have put into your car is a very well designed engine and I would recommend that it is not interfered with. My s type is 10 years old and runs very sweetly, and I find 208 bhp very powerful. Peter.