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Code 21 & 28 - Main Oxygen Sensor Signal

NOTE: Code 21 refers to left bank main oxygen sensor. Code 28 refers to right bank main oxygen sensor.
Fig 1: Codes 21 & 28 Flow Chart (1 of 2) - Main O2 Sensor Signal
G90G18933Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Codes 21 & 28 Flow Chart (2 of 2) - Main O2 Sensor Signal
G92E25381Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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