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Home >> Lexus >> 1992 >> SC 300 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Code Charts >> Code 21 & 28 - Main Oxygen Sensor Circuit
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Code 21 & 28 - Main Oxygen Sensor Circuit

NOTE: Code 21 is for left bank O2 sensor on ES300 or front side O2 sensor on SC300. Code 28 is for right bank O2 sensor on ES300 or rear side O2 sensor on SC300.
Fig 1: Codes 21 & 28 - Main Oxygen Sensor Circuit
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