O2 sensors location up flow and down flow sensors?

2004 CHEVROLET TRAILBLAZER
148,658 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
Avatar
KEN WRIGHT2
  • MEMBER
  • 1 POST
Where are b1 up flow and down flow sensors located?
Jan 21, 2017 at 9:33 AM
Advertisement
Avatar
STEVE W.
  • ✓ASE Certified Mechanic
  • 15,200 POSTS
  • ASE Certified Mechanic
Only has two O2 sensors. One is on the exhaust manifold near the passenger side rear of the engine on the curved area. The other is in the exhaust system behind the converter.
Jun 28, 2021 at 8:02 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.