Location of my knock sensor and does my engine have to be removed to get to the knock sensor
Generally the knock sensor is bolted to the block. You do not have to remove the engine to replace it.
RockAuto.com sells them for $25-$34. Look them up to see what it looks like. -- 2002 BUICK RENDEZVOUS 3.4L V6 : Emission : Knock (Detonation) Sensor
Looking for a Used Rendezvous in your area?
CarGurus has 1,327 nationwide Rendezvous listings starting at $1,995.
Search Buick Rendezvous Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Buick Rendezvous Experts