Sonata GL V6-3.0L (1997)
Oxygen Sensor: Testing and Inspection
CIRCUIT DIAGRAM
TROUBLESHOOTING HINTS
1. If the HO2S is defective, abnormally high emissions may occur.
2. If the HO2S check results were normal, but the sensor output voltage is out of specification, check for the following items (related to air fuel ratio
control system):
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Faulty injector
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Air leaks in the intake manifold.
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Faulty volume air flow sensor, intake air temperature sensor, barometric pressure sensor, engine coolant temperature sensor.
Using GST