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Just changed out my oxygen sensor and I thought I'd make a searchable thread here in the DIY section. What a pain in the ass, my body hurts like hell from wrenching around in awkward positions under the damn car.
Anyway, some tips . . you'll wanna hit those threads with WD40 and let it sit for an hour or two. Even with that, you'll probably still need a breaker bar to get it to release. If you're searching around and can't figure out what size socket you need, it's a 7/8". But it's a special one you need; one that allows the wire to pass through the socket. BavAuto has them for $19, but forget that crap. Run over to your local Pep Boys, they have the same thing for 9 bucks. Here's a picture of it, with the o2 sensor sitting in the middle of it:
Ummm . . . the CEL One day last week it just lit up. I pulled the code (1221). Then on Saturday, the car kept losing power and I was dropping a smokescreen all over the road like Spyhunter. Took me an hour and a half of stopping and going again after the exhaust cooled off, just to get home from across town. FYI: try not to drive it if it's in this condition; it can damage the catalytic converters.
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Your Ride: 1995 325i
I think it took something like 6 months for my tendons, ligaments, and muscle fibers to reconstitute themselves after I went through that gymnastic routine a few years ago. I think AutoZone lends the special wrenches out for free, after you put down a refundable deposit; nice to see though that you found one for cheap money. You're right, a good soaking with WD-40 is in order, and a breaker bar is a big help. It probably helps too if you can put the car up on a lift, as opposed to jackstands, the way I did it, but that luxury isn't always available.