he's right about dpf your right about dpf. the later focus is fitted with dpf and when driven correctly will go into dpf regeneration this takes x amount of time or miles to complete and you will not be aware of it, the problem is when you constantly do short journeys this process will not complete so the dpf will try and try again, eventually it will clog up. Now it’s time for your local dealership to have a go, they will hook a lap top and carry out what’s called a static regeneration. This is a regen but without having to drive the car anywhere they basically just sit out in the car park revving the s***e out of the engine, that sounds a bit cruel but it’s all done very safely with the correct software only ford approved technicians are allowed to do this (dpf is a filter fitted into the exhaust system. It catchers the tiny particles of carbon that would otherwise escape into the atmosphere. Dpf’s are a good thing. Eventually all those tiny particles build up and start to block the filter., so the dpf incinerates the s***e. Heres how it does it, on the exhaust stroke of the engine the ecu or engine management computer tells the fuel injector to squirt a little fuel into the cylinder. Because this was done on the exhaust stroke the fuel is pushed into the exhaust system and into the dpf and because the temperature is so high the fuel is ignited thus raising the temp even higher, this cycle continues until the blockage is incinerated out of existence and everyone happy again.) It’s a good system and it works well. The only people in my experience that have a prob is taxi drivers because of all the short journeys.

I have had DPF problems on my focus especially when I was doing short journeys, the best way to clear it was to blast it up the motorway obeying the speed limit in 4th to get the revs up with the air con on full blast for about 40 minutes. Wynns additive also helped.

The advice I have had from my brother in law who is a mechanic is not to get a car with a DPF if you are doing lots of short journeys as it needs a good run to build up the engine temperature to burn off the particles that collect in the DPF.

Ford recomends that the DPF is replaced after 75k miles which is an expensive event, I plan to get rid of mine before that happens.