There are 4, although the one that often go bad are the one before CAT (the closes one to the engine). You can use after market type. There Are Bosh or NTK (NGK) with direct plug in, which go for under $100 or you can guy the universal one but you will have to cut the wire and solder it together for around $20 each. It is really depend what you want to do.
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How many o2 sensors are in a 99 Toyota Avalon,and what's the estimated cost to replace them?
Linear Mode
