Hi, i have a 207 and the in the manuel , the triangle say`s it is service warning,it say`s to identify problem consult the message on the multifunction display, after checking the(remote control battery) ( the tyre inflation) (the engine oil) ( the screen wash ) the condition of bulbs) and then it say`s for other cases contact Peugeot. hope that helps.
Look in your handbook - it will tell you what all the warning signs mean.
Dunno about peugeot, but other cars will have a warning light like that which means general fault and you have to take the car into the dealers and have them hook it up to their computer to find out what the actual fault is.
Probably engine management. Take it to a garage, there's nothing you can do yourself, and no way on knowing what the fault is until it's plugged into a code reader.