I failed my emission test due to o2 sensor but can't locate it nowhere near my muffler. My heater is not blowing hot air at all I put a new compressor for summer time but it's winter in Chicago can it be the thermostat sensor???

 

What?

One at a time dude...

First, tell us what year, vehicle, and engine you have.

 

Welcome to the forum.

It will help us if you include your year specs for your ride as they differ from year to year.

That said it sounds like you have several issues. Depending on your year, the best way to find your O2 sensors is to start at the manifold and work your way all the way back to the tailpipe. Unless you have an 00-01, you should have 2 of them, one upstream, one down. Upstream will be the one closest to the motor, just after the manifold. Downstream will be just after the cat convertor. 00-01 also have 2 more pre cats just after the mani.

As for your heat issue, try to flush/backflush the heater core, it may be clogged, if that doesn't work, you may need to replace the heater core. Hard to say. You need to do some noggin' pokin'.

 

Sorry guys lol I'm new to this but next time I know 2001 jeep Cherokee sport

 

CEL light on?

 

Yes, I took it to the emission he plug the machine into the machine and it totally drained my battery where we had to push it out smh.

 

You need to pull the codes. It will tell you which sensors are bad. And probably some other stuff, too.

Have the codes read and report back.

 

I took it to autozone so they can read the codes and it won't read it. Don't know if the fuse is blown that's what they suggested.

 

Wanna take a guess what my next suggestion is? LOL

 

Go right ahead lol

 

Check the fuses?

 

which ones do I check?

 

When in doubt check all of them. Under the hood and in the kick panel.

You could try another parts store to see if you get the same result.

 

I did took it to oreilly and same thing, I will check all the fuses by the kick panel. I'll keep you updated thank you

 

You're already in over your head. Take the Jeep to a shop and have it professionally repaired.