Recently bought a Peugeot 308 1.6 vti. The yellow/orange engine management light appears with the ignition in the second position, and remains for a couple of seconds after starting the engine. The car seems to drive fine, with no loss in power or sounding rough. I'm used to a diesel engine car, so maybe it's not apparent if it is running badly, even though the engine idling is lovely and quiet. Connected a fairly cheap obd reader to it and it threw up no codes. Any ideas as to what it can be?