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Your vehicle has 4 Heated O2 Sensors One on each exhaust pipe before the cat converter and one on each pipe after the cat. My book says $96.64 US each one. If one has failed with the age of your vehicle there is a good chance the other ones may be ready to go. Replacing them now would possibly save you difficulty later. At the same time, if anothe one fails it shouldn't stop you in your tracks, so if you wait you might not have to spent the money.
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