Yes, it's easy, takes a special socket
sometimes, old one screws out and
new one screws it, it's in the exhaust
system. When the O2 sensor gets hot
it tells the computer if the fuel mixture
is too rich, too lean or just right, so it just
helps the computer to know what is needed
for fuel. With out it working the computer is
blind, so it goes into a closed loop which
is a rough aprox amount of fuel so your
engine will run, but not deliver the good
fuel mileage it could if it could go to open
loop and adjust the mixture.
Wild
