If it was me I'd want to know what fault is showing. You'll need to get the fault read to find out. The early 1100 models used to spike their catalytic converters because of misfiring problems and there were recalls to replace ignition coil pack, leads and spark plugs.
See
http://www.honestjohn.co.uk/carbycar/peugeot/206-1998/?section=bad
ChicksFan
April 2011