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Q: How many oxygen sensors are there on a vehicle?

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Need to know how many o2 sensors there are total, and if possible the locations of them. Its a 2004 Mazda 6, v6. I think its 2 o2 sensors but im not sure. My car has a manual transmission.

A: Your vehicle and engine will have four O2 s...

Your vehicle and engine will have four O2 sensors. There is one O2 sensor in each exhaust manifold and one after each catalyst. This is a diagram of your exhaust system to see O2 sensor locations.

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