Quote:
Originally Posted by dfpgnm
I used a crow'sfoot wrench and a 3/8 ratchet to get at mine from below. Could only get a couple of clicks on the ratchet at a time and had to re-seat the wrench and ratchet every two turns or so. Biggest problem was the sensor was so rusted and corrosion fused to the pipe it ultimately cracked and I had to pull the y-pipe. Of course, the rusted studs that held it to the manifold broke and I had to pull the manifold to get things fixed. Luckily, I was able to get the manifold off without having to pull the head and re-tap that. So what should have been a 30 minute job wound up going into a second weekend.
Oh, and if you're replacing the sensor, there's no reason not to cut the wires off at the sensor: then you can move the connection up into some free area in the engine compartment to unhook it.
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Doing it on the 3.0 seems very easy. One down from each header, and two on the pipes from under neath. The two header ones can be reached very easily with a TON of room with the 3.0 from the top/engine bay. Haven't looked at the under neath ones, but they shouldn't be too hard.
However I know with the 4.0 theres no room to do spark plugs, let alone the o2 sensors on the headers.
I've heard before that with o2 sensors, you should get an o2 socket, (similar to spark plug sockets), which can be found at any auto store.