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Home >> Lexus >> 1995 >> SC 400 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Oxygen Sensor Operation >> Sub-Sensor(s)
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Oxygen Sensor Operation: Sub-Sensor(s)

  1. Clear trouble codes. See appropriate TESTS W/CODES article. Warm engine to normal operating temperature.
  2. With transmission in Drive, cruise at 50-55 MPH for 10 minutes or more. Stop vehicle and idle engine for 2 minutes or less. Accelerate vehicle to 50 MPH with throttle fully open. Turn ignition off. Retrieve trouble codes. If no codes are set, sub-sensor circuit is functioning properly. If any codes are set, repair as necessary. See appropriate TESTS W/CODES article.
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