ive tryed this and in theory should work as it should trigger the regeneration mode but ya need really hot temps , it never worked for me, if you just want to get rid of the annoying beeps and messages telling you that the antipolluion filter is fucked try this!!

start the shitroen c5 for 5 secs then remove the key and take it away from the car just for a few secs then return and do the same thing 5 times ensuring the key is away from the car, on the 6 time when you restart it resets the ecu and no service lights or anything ,,it works iv tryed it tonight.. shitroen use a lexia scanner to do this..

Andy