got three 02 sensors from the states $35.00 each ( with fittings ),pre soaked with wd40 ,got the sensor off from underneath on exhaust ok and replaced,the one on top of the exhaust took most of the thread from the exhaust with it ,couldnt relace ,but managed to get old one back in and the one near the bulhead on the exhaust....just couldnt get any leverage..so my local garage is going to retap the offending hole and put sensor in and replace the sensor i cant get off ( if this one had lost its thread the only answer would off been to cry ) ...was told the one one the cat doesnt affect fuel etc..so that stays... any one had an easy job ?

I only needed to replace one on mine, soaked it in wd40 the night before and borrowed the special tool from my mechanic mate. Came off easy, was a 10 min job