Rep Power: 0

I got a 2001 EX coupe, 5 speed with 90000 miles
Anyways....i think I got a bad oxygen sensor..
The check engine light came up. I checked the engine and the engine is there =)
I got bad fuel milage...down about 25%
When I shift I hear this rattle coming from the engine like the car is going to die out and stall.
The exhaust fumes stinks like its full of gas.

What do you guys think?
O2 sensor?

 
Rep Power: 0

could also be the cat dying...next time the cel comes on have it scanned and find out what the code is

 
Rep Power: 340

sounds like an o2 sensor is bad, in limp mode the car pumps in tons of gas

so you run rich

and yes, next time the cel is on, get it scanned