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Home >> Lexus >> 1991 >> ES 250 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Trouble Code Charts >> Code 21: Main O2 Sensor Signal Or Heater Signal
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Code 21: Main O2 Sensor Signal Or Heater Signal

Fig 1: Code 21: Main O2 Sensor or Heater Signal
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