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The first O2 sensor is located just below the header/exhaust manifold, and can be seen just below the header's heat shield. It is most easily accessed by removing the driver's side wheel.

The second O2 sensor is located after the catalytic covertor between the rear wheels at the 12 o'clock position.

Because Miata engines typically run rich, it is not uncommon for the first O2 sensor to die early.

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