Mike's Workshop Manuals
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Hyundai
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2004
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Elantra GLS, Standard
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Repair and Diagnosis
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Engine Mechanical
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Fuel System
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DTC Trouble Shooting Procedures
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DTC P0139: O2 Sensor Circuit Slow Responsive (Bank 1, Sensor 2)
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Inspection Procedures
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2. Check Intake System For Vacuum Leakage
2. Check Intake System For Vacuum Leakage
Visually check intake system for vacuum leakage.
Is any leakage present?
No: Go to next step.
Yes: Repair it.