Hyundai Sonata 1991 Shop Manual page 24

MAINTENANCE SERVICE
The oxygen sensor is a device which controls the fuel mixture.
If the oxygen sensor is damaged, the exhaust emissions as well
as driveability deteriorates. Therefore, it should be replaced
periodically with a new one.
REPLACEMENT OXYGEN SENSOR
FUEL SYSTEM
Tank, Lines And Connections
Yl0EJOA
Y10EKOA
Hexagon nut Housing .
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1. Check for damage or leakage in the fuel lines and
connections.
2. Inspect the surface or fuel hoses for heat and mechanical
damage. Hard and brittle rubber, cracking, checking, tears,
cuts, abrasions and excessive swelling indicate deter.ioration
of the rubber.
3. If the fabric casing of the rubber hose is cracked or worn,
the hoses should be changed.
Fuel Filter
The fuel filter should be replaced regularly because its
performance is reduced by dirt and water collected over an
extended period of use. Replace as required.
10-12