Which socket would be best to buy for removing a lambda sensor? The first one looks stronger, but i'm not too sure. 1) 2)
No 1, I have a Snap-On no2 and it spreads out on really tight sensors. Heat up the exhaust with a blowlamp before you try and undo it is the best advice I can give.
another option is if sensor is dead chop the wire and slot a proper socket/spanner over it, as above I have #2 and its fine to do up new ones but it can get a bit tricky if sensor is stuck! edit: or if not de-pin the plug and slip the spanner alllll the way down the wires