02 Sensor

[tedward]

I have a 99 2dr tahoe with 4wheel drive, does anyone know how to replace a 02 sensor? Thanks for the help as always!

 

[retorq]

Unplug it, unscrew it, screw in new one, plug it in.

 

[tedward]

where is the 02 sensor located?

 

[05Yukon23]

where is the 02 sensor located?

Usually found close to the cats. I'm not sure exactly on the 99.

 

[LI99HOE]

You should have 4 of them Ted.
2 pre-cat, and 2 post-cat. Just poke your head under there, and you'll see 'em.
Don't forget to clean each of the bung's threads before you install the new ones.

 

[SunlitComet]

What is telling you that replacement is needed?

 

[tedward]

The check engine light came on . My mechanic said the 02 sensor needs to be replaced.

 

[L8RH8R]

I have a 99 two wheel drive and just did a cat back exhaust today. There is an O2 sensor just after the cats.

 

[SunlitComet]

That is to vague. Specific code please?