The 1999 Corolla service manual specifies a torque of 44 N*m ( 450 kg*cm, 31 ft*lb). You can't go too wrong with that.

 

Somethings wrong here..31 ft lbs for two bolts attaching an o2 sensor? If they are 6mm, they should have under 10 ft lbs.

 

That does seem off now that I think about it, but I don't know the socket size. I must have read wrong (missed a decimal or something). I'll double check when I get off work. Sorry.

 

try 3.1 ft lbs

 

I never torque a 6mm (10 mm head) bolt over 100 IN. lbs.

 

No typo. That's what the manual says. Can anyone else verify this?

 

Thanks for the info... 31 ft/lb seem a little excessive. However, you need a tight seal there ... I think bolts are a bit bigger then 6mm (10mm?)

 

To bring this up to date: I am replacing the O2 sensors in my 1996 Camry V6 wagon.
The torque specification is 31.0 ftlbs for Denso/Bosch style sensors. These sensors thread into the exhaust manifolds and one after the catalytic converter.
Hope this helps others in the future.
Rent the split socket set from an auto parts store. A must.
There is a fair youtube post that gets the basics communicated:

 

I left my fsm at home, i will look when I get there this evening. I have a 2000 prizm. First off the bolts that hold on the 02 sensor pre cat are studs. The two nuts on the studs are a 12mm head. I don't believe 31 lbs is correct.
And I just seen this was bumped from 2008.... And we're comparing a V6 Camry to a 1zzfe.....

 

I checked the FSM. The two nuts that secure that sensor are marked 14 ft-lbs.

 

I tighten to, well, until tight... it's a dang sensor, it's not like it's holding a wheel on the car. Just snug it up and then tighten it. Use common sense and don't put a 1/2" socket and a 3 foot breaker bar on it, just tighten the bolt by hand. The nuts are flared (original ones anyhow) so they're not going to back off...

 

+1, GutenTight if your german. Its not a suspension or internal motor part. The torque wrench can stay in the box just dont go crazy on it and make it a little snug. I would advise changing the gasket out. Although I did just remove and reinstall mine with the original gasket and it seems to have melted itself back to a decent seal.