if the Exhaust is broken before the oxygen sensor does it consume fuel ?

2004 HYUNDAI SONATA
145,000 MILES
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OMARIOV.A
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all my sensors are checked and are working good , oxygen sensor new along with the sparks and injectors ,although it consume lot of fuel , i can almost breath fuel inside the cabinet , i think i have a broken Exhaust very close to the engine and before the o2 sensor , but does that is the reason why i lose fuel so fast ? does it effect engine pressure ? although my car performance is great and fast, i need to fill it every trip ??? plus i notesed some oil mixed with fuel between the engine and the top of the Exhaust . please help ^^ bye the way i enjoy this site a lot keep it up wish you the best .
Dec 12, 2011 at 1:48 AM
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RIVERMIKERAT
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it could. It could cause the computer to think the engine is running too lean (not enough fuel) and cause more fuel to be injected into the cylinders. Fix the leak. Otherwise, you'll end up with a much more expensive repair. At the best, you'll end up burning an exhaust valve, requiring a top end tear-down and a valve job. At worst, you can burn up the engine.
Dec 12, 2011 at 2:12 AM