i had depolution system fault on my peugeot 207 and the orange engine lights stays on. take car to peugeot they did a diagnostic test and told my coils and plugs need to be changed and cat converter is ageing. plugs and coils where replaced with new and depolution system faults and engine lights went off. after driving for like 3 weeks depolution system faults pops up again and engine lights also comes up. dont know now what the problem may be. Please any1 help.
who knows what the problem can be?

eugene, May 2015

Are you using cheap supermarket petrol and/or using the car for mainly short runs? If so you are probably getting unburnt hydrocarbons getting through to the lambda sensors and setting of the warning.

Use decent fuel Shell V Power Nitro+ or BP Ultimate, and take the car on a longish run (20 miles or more) to get the engine properly warmed up. This should burn off the hydrocarbons, and the warning should go out eventually. If you're just popping round the shop for a paper - walk instead of using the car. No car likes constant short runs with a cold engine.

ChicksFan, May 2015