O2 sensor replacement

[XJ5]

Hey guys, 1997 4.0 check engine light came on and I got a code 21, poor fuel economy, and hard starting when cold. Autozone scanner confirmed O2 sensor. Should I go with Bosch or one of the cheaper brands on rockauto or oxygengeek.com? Has anybody had any experience with those other brands? Also, any tips on breaking the old one loose? TIA

 

[dodo4bird]

I believe these are the cheap ones that people have been buying.
I have not heard any complaints yet????

http://www.oxygengeek.com//index.html

I also bought one but have not installed it yet.

 

[xjbubba]

Personally, I'd go with the Bosch, from Rockauto.
As far as removal goes, warm up the engine to ~ 140*, let cool until still "quite warm", but manageable to work with, then remove the O2 sensor with a box-end wrench, or socket specifically made for sensor removal.
Make sure your new sensor has anti-seize on threads before installing (they normally come with the anti-seize already applied); Install and torque to specs (see FSM, or equivalent).