The new common rail TDI's *should* have solved the injector issue affecting the former PD125 cars in the MKV 2006-2009 era. The problem with the injectors seems to be oil eventually getting past the seals into the pizeo stack and shorting it out. Pizeo is new technology and they use this tiny crystal osscilation to control the injection, problem was in the former 125kw's the whole injector is inside the engine, bathing in oil. Common rail removes the injector to outside the engine itself, so it no longer has the oil contact. Biggest potential problem facing common rail is the high pressure fuel pump, and the fact the boys in the USA have been having a lot of problems with theirs. Seems to be concentrated in the USA though, so if i had a new 125 right now I wouldn't be too worried.
As for DPF's, they do indeed have separate Cats and DPF which is a much smarter idea than the first generation found on the PD MKV version. there is a cat right out of the turbo, then the DPF itself in the same spot as the former, then a subsequent big cat. Now if the DPF should clog down the line, you can just buy the DPF component without having to also pay for the expensive metals in the cat. A big improvement, but I do believe the problem now is some models also have a flap in the exhaust to aid regeneration, and this has been playing up on the yankie 125's - again may jusy be localised to them.
In all I think the new 125 will be a LOT better than the former version in terms of reliability, power delivery especially off boost, economy and DPF regeneration. common Rail was designed with a DPF in mind, the former PD was never designed to work with one.
Enjoy your new toy, just be sure to try and use BP or Caltex Fuels!
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