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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 EO48, EGR System Fault (1 Of 2) >> Failure Conditions:

Failure Conditions:

If oxygen sensor fails to indicate a leaner mixture in at least 3 of 5 tests during the key cycle, Code EO48 is set.

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