O2 Sensor Problem Help!

IntegratedLS

IntegratedLS
Now with my car i believe i am running too rich because im getting about 13 miles to the gallon. Also my gas is getting in the oil and flooding it out, and my muffler is saturated with carbon, its pitch black. I had a dry compression test done on it and it passed so i dont believe its the piston rings. I just recently had my oil pan gasket replaced and when he did it he had to drop the exhaust done and what i think he might have done was forget to put the O2 sensor back in and my car isnt getting enough air and its flooding itself with fuel. Do you know if that might be the cause or what else may it be. I have a 1992 Integra GS. Let me know what you guys come up with.
 
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