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Home >> Lexus >> 1994 >> SC 300 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Except OBD-II >> Diagnostic Code Charts >> Code 28 - Main O2 Sensor CKT (Rear Sensor)
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Code 28 - Main O2 Sensor CKT (Rear Sensor)

Fig 1: Code 28 Flow Chart (SC300) Main O2 Sensor Circuit
G94D45248Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Code 28 - Inspection Using Oscilloscope (SC300) Main O2 Sensor Circuit
G94E45249Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Code 28 Trouble Code Detection Test (SC300) Main O2 Sensor Circuit
G94D45230Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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