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General Car Chat / Re: Understanding DPF issues
« on: 19 February 2024, 13:37:39 »The 2.0 CDTi glow plugs also monitor the cylinder pressures, I suspect a faulty one would show a low compression fault code and might also cause a change in the idle. It sounds like this is a confirmed issue given the codes and the fact the cylinder pressure is measured as good so the first job should be to repair this.
DPF regen gets inhibited when many engine faults are active, this is done to protect the system/engine from overheating or bore wash during the active regen phase.
So change the glow plug, ensure the codes are cleared, check the live data to confirm cylinder pressures are good, and go for a good drive to regen the DPF (forces regen should be avoided if possible!), if it does not regen then do a forced one.
Not rocket surgery but, we all know how to many mechanics struggle with the basics these days
Thank you - glo plug changed and all good so far. Just a bit of a long way round to get there. I suppose with hindsight and knowing that only part of the glo plug will throw a code pointing to the glo plug then it would have been an idea to swap a glo plug over from a cylinder which was not exhibiting a pressure issue. Anyhow - job done now.