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Home › Cadillac › 1990 › Seville Base, 4T60/ME9 › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes › ECM Trouble Code Charts › ECM Code EO17: Left Oxygen Sensor Not Ready › Failure Conditions:

Failure Conditions:

Oxygen sensor voltage stays between .307-.609 volt for more than 64 seconds (not toggling).

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