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Hyundai
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1998
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Sonata GL L4-2.0L
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Repair and Diagnosis
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A L L Diagnostic Trouble Codes ( DTC )
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Testing and Inspection
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P Code Charts
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P0418
P0418
P0418: Secondary AIR pump relay B - circuit malfunction
Probable Cause: wiring, AIR pump relay, ECM
Hyundai does not provide any diagnostic information for this DTC.