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How many O2 sensors are on these cars?

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How many O2 sensors are on these cars?

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Old 11-09-2018, 11:46 PM
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How many O2 sensors are on these cars?

I replaced the cat about a month ago, and I recall only one O2 sensor. Is this correct, or is my memory faulty? If there is only one, how is the cat's functioning monitored? On my Miatas, and I suppose a lot of other cars, there is a sensor at the exit of the cat, that checks to see if the cat has done it's job. If that isn't there, what does the RX use?
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Old 11-09-2018, 11:57 PM
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one is pre cat and one is behind the cat. the one in front of the cat is expensive, behind not so much.

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Old 11-10-2018, 12:06 AM
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Thanks.

Last edited by Greasyman; 11-10-2018 at 12:08 AM.
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Old 11-10-2018, 03:58 AM
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To add:

The front one is an AFR sensor aka wideband sensor. Instead of voltage swings, it gives a lambda value to the ECU so it can adjust the fuel trims.

The rear one is a more traditional O2 sensor aka narrowband. It does the normal voltage swing and all it really does is checking if the cat is working.
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