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Air/Fuel (A/F) Ratio Sensor Monitor

NOTE: Once procedure is started DO NOT turn ignition off. When negative battery cable is disconnected, all readiness test codes are cleared.
  1. Ensure ambient temperature is 20-95°F (-7-35°C). Connect scan tool to DLC. Start engine, and hold at 3000 RPM under no load condition with transaxle in Park or Neutral until radiator cooling fan comes on. Allow engine to idle for 5 seconds.
  2. Drive vehicle at a steady speed between 50-62 MPH with transaxle in D4 position for about 2 minutes. With transaxle in D4 position, decelerate from 62 MPH by completely releasing throttle for at least 5 seconds. If engine is stopped, accelerate back up to 62 MPH for about 2 minutes and repeat deceleration process. Readiness code should now be set. Use scan tool to check readiness code.
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