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I have a peugeot 407 05 hdi 1.6 sw it's done 123k I've had the car 18 months it's had depolution system fault before I replaced the EGR valve ,last time I had used wynns dpf filter cleaner and it cleared it for 12 months ! It came on again but thought it was same problem as I was only doing short journeys , I used wynns again took car for long drive doing hi revs but still engine light on and saying depolution system faulty but after a 2 weeks started flashing twice ! I took it took local garage who did a diagnostic on it and said he can't read codes on his machine as need to go peugeot dealer and get it done properly but codes he had said EGR electro valve stuck open and heater circuit stuck open valve ! I was wondering if anyone had any info on this ?
 
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