Hi all - am new user and greatly appreciate any help at all!!

My pug recently developed P0401 "EGR insufficient flow" so I removed and cleaned EGR pipe and surrounding pipes out although they were not all that clogged. This is accompanied with severe lack of power (limp mode i guess). Next I tested EGR valve vacuum operation - again seemed fine and also did basic check of elec current - seems OK. Also checked servo operation, for hose leaks down to turbo - again no probs detected.

Had fault cleared, ran car, no difference ie; no power and fault code returned. Next cleaned MAF (Airflow) sensor on engine intake pipe but also no difference.

$$$ Ran the car with MAF sensor unplugged and power fully restored again - hooray!! (not a permanent fix though).

Does this necessarily point to faulty MAF sensor though (£90 - ouch)? - you see my mate who works in Peugeot parts says they very rarely sell these. So before I buy this any ideas??? - i mean the fault is P0401 EGR...

LAST NOTE:- just prior to all this, battery totally died, so replaced it - P0401 came on very shortly after this - although I can't see a connection unless when new battery was connected it put a spike through the ECU causing reoccuring spurious code - again any ideas welcome....?

many thanks ---> SU37