Hi

This one came in with DPF fault code & glow plug x4 fault codes

The glow plug relay fixed the glow plug codes, thought that may effect regen so did that first

Took it for a run and it attempted to regenerate the DPF, but after about 20 miles logged DPF fault again. When I say attempted, the regen the active message on the scanner cycled on and off and exhaust temperature reflected this.

Took the DPF off and washed it out, this made a notable improvement to exhaust pressure. ( Pre clean peak of 750 m/bars and post clean peak of 209 M/bars). It then completed a regen on road test, this time remaining active and constant exhaust temperature for duration ( about 10 miles)

Thought at this point had won the battle, so changed the oil & gave it another road test, rechecked memory and dam thing now logging a fault code EGR system 4501 and EOBD pending code p0409.

We have cleaned and checked (with myti vac) the EGR valve I have check vac pipes and vacuum supply all appears OK. removed EGR cooler and pipework and cleaned. Still logging low flow fault

I have compared MAF readings with known good one ( readings kindly supplied by TBK member) and to me would indicate MAF ok but EGR flow low.

So I am looking for suggestions as to causes for low EGR flow.

sorry for long post

Cheers Aidan