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Cadillac
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1990
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Seville Base, 440T4/ME9
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Tests W/Codes
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ECM Trouble Code Charts
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ECM Code EO43: Left O2 Sensor Rich Signal
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Failure Conditions:
Failure Conditions:
Oxygen sensor stays rich for more than 50 seconds.