O2 sensor removal

[ncouraud]

So I failed my emissions test, no big deal, I was planning on getting a new o2 sensor anyways. Problem is, I can't get the old one out.

Are there any tricks? I've tried using a wrench, as I couldn't find a socket that would be deep enough yet still fit through the space between the top and the driveshaft tunnel.

[jlevie]

Liberally soak the sensor with PBlaster for a day or two and don't drive the car while the PBlaster is working. Use a box end wrench and if it still won't break loose, hit the nipple with an oxyacetelyne torch.

[tim88325is]

Drive the car to get manifold hot, carefully loosen with a box end wrench just a bit to get it started and break the rust's grip. Let the manifold cool and then it can be removed safely.