What size wrench do we use on the Oxygen Sensors?? I need to swap mine and don't have a wrench big enough and need to buy one.

 

7/8ths

 

You sir, are the man. I'm off to the Sears Hardware store!!!

 

They sell an actual socket for the O2 sensors, I reccomend buying that as it applies even pressure to the sensor. Sometimes the heat and some corrosion can make it difficult to remove the O2 sensor, I actually damaged the threads and had to put in a new O2 bung on my Y pipe drivers side.

 

Or you can buy one of those tools but i always use a 7/8ths wrench......