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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 EO42: Left O2 Sensor Lean Signal >> Failure Conditions:

Failure Conditions:

Oxygen sensor status stays lean for more than 50 seconds.

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