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

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Fig 2: Codes 21 & 28 Flow Chart (2 of 2) - Main O2 Sensor Signal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002