The primary 02 sensor should be in the exhaust before the cat.
Feb 19, 2014 at 12:34 AM
HONDATECH1983
✓Experienced Mechanic
109 POSTS
It is located just before the catalytic converter.
Mar 2, 2014 at 9:41 PM
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.