replacing oxygen sensor troubles..

[mole]

I'm trying to replace the single oxygen sensor on my 95 325i.

The sensor doesn't want to seem to budge, I've but a lot of force on it with my socket wrench but nothing happens.

So to the people who have replaced theirs... how'd you get it off?

[SHOracer]

Takes some muscle, the right sized crow foot wrench and spray lube. Hope that it isn't rusted too bad and the previous one was installed with anti-seize as required.

[mole]

Yeah it's not coming off. I've used both arms with full strength.
I guess i'll have to take it to a mechanic.

[Justin Sane]

Try throwing some heat on it with a propane torch. Have had to use this trick before. Use anti-seize compound on the threads of the new one.

[kentd98]

1) soak it with pb blaster overnight.

2) put a long pipe over the end of the socket wrench to increase your leverage.

[SQ Bimmer]

1) soak it with pb blaster overnight.

2) put a long pipe over the end of the socket wrench to increase your leverage.
Exactly what I was gonna suggest. And if you don't have a big pipe sitting around (which every home mechanic should :stickoutt), then use a big open end wrench on the end of the ratchet to get more leverage.

Just recently the arm that pumps up my floor jack came off (loose bolt) and I happened to need some leverage so I used it. Having a 4 foot breaker bar REALLY got that damn bolt off (not o2 sensor, I was working on something else).

[mole]

The problem with using a long ended pipe is that there is no room! I can barely fit my socket wrench up there as it is...

[Kevin325i]

Drop the exhaust at the downpipes and the brace across the tranny. Then you'll have plenty of access to it. Makes it a ton easier.