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Oxygen Sensor Relay

  1. Ensure there is a clicking sound heard at oxygen sensor relay when ignition is turned on and off. Apply 12 volts to terminal A and ground terminal B. See Fig 1 .
  2. Measure resistance between terminals C and D. With 12 volts applied, resistance should be zero ohms. With no voltage applied, resistance should be infinite.
Fig 1: Oxygen Sensor Relay Connector Terminal Identification
G94842Courtesy of MAZDA MOTORS CORP.
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