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Have a 51 plate Renault clio 1.2 16v with the same problem. The toxic warning lamp is on all the time and there is a clicking from the offside headlamp area which goes on for 30 seconds or more when the engine is switched off.
The clicking is the Evaporative purge valve which appears to want to operate all the time the engine is running. The haynes manual states the valve should ONLY operate when the engine is up to temperature and with the throttle above the idle setting. It would therefore appear to be a problem with the EMU.
I was wondering if the valve is operating all the time if the engine is being over fueled thus causing the toxic warning light to operate.
I am also looking for a recommendation for a software package that can interogate the EMU and return the DTC codes. There appears to be a number of products out there any help would be appreciated.