To be certain, you'll need to:
1. Consult a repair manual specific to your 1997 Pontiac Sunfire's engine. This is the most reliable method. A Haynes or Chilton manual will have diagrams and precise locations.
2. Use an online parts diagram. Many auto parts websites (like AutoZone, Advance Auto Parts, etc.) allow you to look up diagrams for your specific year, make, and model. Search for a diagram of your engine and look for the CKP sensor.
Don't rely solely on general descriptions; use a repair manual or parts diagram to pinpoint the sensor's location on *your* specific engine. Incorrectly identifying the sensor can lead to further problems.