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O2 SENSOR on 2003 Toyota Highlander

ENGINE LIGHT WAS ON AND IT WAS SMELLING REALLY BAD GAS I VE CHANGED MY O2 SENSOR YESTERDAY AFTER I CHANGED IT IT STARTED AND ENGINE LIGHT GONE .THIS MORNING I WAS GONNA GO MY JOB THE CAR DIDNT START AND IT SMELL LITTLE GAS AGAIN WHAT MIGHT BE THE PROBLEM after i ve changed sensor it worked now it doesnt start ?

Asked by for the 2003 Toyota Highlander
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First verify secondary ignition by checking for spark. Then compare values to fuel pressure specifications. If neither diagnostic procedures make a difference, focus on catalytic converter efficiency. Fuel is the enemy of the catalytic converter, if it had been running rich until the O2 sensor was replaced, the cat. may be damaged impairing fuel control and/or loss of catalytic converter efficiency. A restricted exhaust may also need to be diagnosed.
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