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How many Oxygen Sensors does a '94 Corolla have?

(1994 Toyota Corolla)
in Dandridge, TN on January 06, 2013
I had a tune up done about 2 months ago also the clutch changed... The car is now using way more gas then before so I'm trying to figure out things that I can replace to make the fuel economy better and was told this could help a great deal. Any other suggestions would also be extremely helpful! Thanks :)
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