Little trick I learnt for replacing our 02 sensors πŸ‘πŸ‘

Little trick I learnt for replacing our 02 sensors πŸ‘πŸ‘ - BMW E46 3-series Forum

Spend a good day on my 2 post cat 02 sensors this weekend and of course being out of a 15 year old car they diddnt come out without a fight. Firstly never buy one of the removal tools from halfords they are a poor fit and round off the heads…

Anyway to the point it’s very likely removing your 02 sensors will strip on thier way out (b**s) clogging the thread in the exhaust holes making it impossible to thread your new sensors in. Take your old sensor (the one with the most thread), smash or cut down to the bolt head. Then cut 3 grooves in the thread as shown in the picture. Congratulations you have yourself a perfectly sized tap. You can use an ordinary 22mm socket, work the tap tight and loose repeatedly taking it out and spraying with wd40 and cleaning the thread consistently and you will have perfect thread to screw your new sensors In to!

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