To find it definitively, you'll need to:
1. Consult a repair manual: A Haynes or Chilton manual specific to your year and engine size will have a diagram showing the precise location.
2. Use an online repair database: Sites like AllDataDIY or Mitchell 1 (subscription required) have detailed diagrams and repair information.
3. Search online for images: A Google image search for "2002 Chevy Tahoe crankshaft position sensor location [your engine size]" may yield helpful pictures.
Important Note: Accessing the CKP sensor often requires removing some components, so be prepared for that. It's usually a fairly straightforward job, but again, a repair manual will provide detailed instructions.