get one off ebay for around £110 - mine needs changing too... a clio 1.4 i think was keeping up with me the other day... got away from it in the end and this is after a full service using mobil1 oil grrr...
thanks got one second hand cost 100 pound though also needed o2 sesor the one b4 the cat 54 dollars from www.oxyegensensors.com the c230 kompressor over there has virtualy identical cars