1994 Toyota Corolla Q&A

1994 Toyota Corolla Question: How many Oxygen Sensors does a '94 Corolla have?

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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