Hey!! I just replaced mine - My car is a 4cyl - not sure how much difference - but there are 2 sensors. The pre-cat is right in the front of the engine on the manifold - I needed a slotted socket to fit in there because of the surrounding heat sheild and the wiring gets in the way. You can borrow from AutoZone. The other is on the rear of the manifold near the oil filter. The page in the Haynes manual is 6-15. Good Luck!
