My Peugeot 308 petrol keeps cutting out on me with the warning" depollution system faulty" displaying also the engine management light is on (EML) ,what can cure it ?
I had the same problem on my 308 (58 plate), it can be several things,you need to get a diagnostic check to read the fault codes on the cars computer memory, any decent garage can do this.
Mine showed 2 misfire fault codes,and that 2 of my ignition coils were faulty, so to play it safe i changed all 4 coils and plugs,it only takes 10 mins and there is plenty of Youtube clips to show how , it now runs ok, total cost for the parts was £115 inc VAT.
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2005 vD
gazza 
November 2017
