To be certain, you should:
1. Consult your owner's manual: This is the best resource for the exact location on your specific Vibe.
2. Use a repair manual: A Haynes or Chilton repair manual for your year and model Vibe will have diagrams showing the PCV valve's location.
3. Search online: Searching "[Your Vibe's Year] Pontiac Vibe PCV valve location" on Google Images or YouTube may yield helpful images or videos.
Be aware that some access might require removing other components, like the air intake system.