I replaced both of mine with universal sensors. They both came with a special crimp connector and both warned not to solder the connections. Don't really know the reason why although there may be some odd resistance possibly created somehow with certain solder. I tried some standard O2 sensor sockets and none worked. I resorted to crushing the old O2 sensor with some Visgrips and pulling off the can so that a 7/8 socket wrench would fit.