Sonata L4-2.4L (1990)
Battery Cable: Customer Interest
MIL ON - Oxygen Sensor Fault Code Set
Subject
RECURRING CHECK ENGINE LIGHT
Group
ENGINE
Number
016
Date
APRIL, 1989
Model
SONATA
Condition/Complaint:
Recurring illumination of the "check engine" light, accompanied by an oxygen sensor fault code in the ECU self
diagnostic memory.
Cause:
Poor alternator to engine ground and excessive resistance in battery ground circuit.
Correction:
1)
Remove the alternator from the vehicle and clean the mounting surfaces on both the engine block and the alternator. Make
sure to remove any corrosion on the engine block mounting pad and the alternator steel sleeve. Apply a light coat of dielectric
grease to all of the mounting surfaces and reinstall the alternator.
2)
Replace the battery ground cable. Be sure to thoroughly clean the negative battery post and the bellhousing mounting surface
before installing the new ground cable.
