Miata 1990-1997

Oxygen Sensor

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Operation



Specific to:

Mazda Miata 1990-1997

The Oxygen (O 2 S) sensor reacts with the oxygen in the exhaust gases and sends a voltage signal to the Electronic Control Unit (ECU) based on this reaction. A low voltage signal indicates too much oxygen or a lean condition while a high voltage signal indicates not enough oxygen or a rich condition. The ECU uses this information along with other sensor inputs to calculate air/fuel ratio.

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Fig. The Oxygen (O2S) sensor (A) is threaded into the exhaust so that the element (B) is in the exhaust gas stream

The Oxygen (O 2 S) sensor is threaded into the exhaust manifold and/or pipes.

Removal & Installation



Specific to:

Mazda Miata 1990-1997

  1. If necessary, remove the under vehicle splash shield.
  2.  
  3. Detach the Oxygen (O 2 S) sensor electrical connector.

    Click image to see an enlarged view

    Fig. To remove the O2S sensor, first remove any splash shielding from the underside of the vehicle as required



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    Fig. Detach the O2S sensor wire connection..



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    Fig. .. then loosen the sensor..



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    Fig. .. and remove it from the exhaust pipe or manifold

  4.  
  5. Remove the O 2 S sensor from the exhaust manifold or pipe.
  6.  
  7. Installation is the reverse of the removal procedure. Tighten the O 2 S sensor to 22-36 ft. lbs. (29-49 Nm).
  8.  

 
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