where is the o2 senser on a 4.3 engine
Hello snag-- The Oxygen Sensor on your 1991 Chevrolet Blazer is underneath the truck on the passenger side, below the front seat area. You will notice a "Y" shaped exhaust pipe. The Oxygen sensor is located inside of that. Good luck from Bovan.
Search Chevrolet Blazer Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Chevrolet Blazer Experts