2013 Mazda MX-5 Miata Grand Touring, Automatic TransFACTORY OEM SERVICE PROCEDURE

A/F Sensor Current Inspection

  1. Warm up the engine to normal operating temperature.
  2. Using the M-MDS, monitor the following:
    • Vehicle speed (PID: VSS)
    • Engine speed (PID: RPM)
    • A/F sensor current (PID: O2S11)
  3. Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3, 000 rpm or more. 
  4. Verify that the A/F sensor current (PID: O2S11) is 0.25 mA or more  while decelerating as shown in the figure.
    Fig 1: A/F Sensor Current Characteristics Graph
    G06151091Courtesy of MAZDA MOTORS CORP.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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