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In 1999-2000, Mazda designed 2 exhaust versions.

The most common version is the Federal-spec Miata. This exhaust system has the typical, single catalytic converter with an O2 sensor before and after it.

  • The front O2 sensor is before the catalytic convertor and can be seen by removing the driver's side wheel.
  • The rear O2 sensor will be just after the catalytic converter, at the 12 o'clock position between the rear wheels.

The California-spec Miata had a precatalytic converter directly installed on the exhaust manifold/header, as well as the standard catalytic converter running the length of the engine.

  • You will find the first O2 sensor directly on the header, just above the pre-cat. It is easily seen from the driver's side of the engine bay.
  • The second O2 sensor is found just below the pre-cat, but before the main catalytic converter. It is easily seen by removing the driver's side wheel.
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Q: Where is the rear 02 sensor on your 99 miata?
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