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Home >> Hyundai >> 2004 >> Elantra GLS, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel System >> DTC Trouble Shooting Procedures >> DTC P1166: O2 Sensor System Lambda Bank Controller At The Limit (Bank 1) >> Inspection Procedures >> 3. Check PCSV
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3. Check PCSV

  1. Disconnect the PCSV connector and the EVAP hose (PCSV side) between the PCSV and the canister
  2. Check vacuum at the PCSV.

Is PCSV normal? 

Yes: Go to next step.

No: Replace it.