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Home >> Hyundai >> 2004 >> Elantra GLS, Standard >> Repair and Diagnosis >> Engine Mechanical >> Fuel System >> DTC Trouble Shooting Procedures >> DTC P0139: O2 Sensor Circuit Slow Responsive (Bank 1, Sensor 2) >> Inspection Procedures >> 2. Check Intake System For Vacuum Leakage
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2. Check Intake System For Vacuum Leakage

  1. Visually check intake system for vacuum leakage.

Is any leakage present? 

No: Go to next step.

Yes: Repair it.

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