1994 Mazda b3000 O2 sensors

1994 MAZDA B3000
175,000 MILES • 6 CYL • 4WD • MANUAL
Avatar
TURBOACC
  • MEMBER
  • 1 POST
I recently bought this truck and failed a state emissions test. I replaced the spark plugs, wires, cap and rotor, did an oil change, and bought O2 sensors. The salesman at NAPA told me this truck has 2, but I can only find the O2 sensor on the exhaust manifold by the transmission. Is there another, and if so, where is it? Is there anything else I should do to pass emissions?
Aug 31, 2009 at 9:26 PM
Advertisement
Avatar
MERLIN2021
  • ✓ASE Certified Mechanic
  • 17,250 POSTS
  • ASE Certified Mechanic
There is always 02 sensor(s) B4 the cat, and one after the cat, check for a connector there that's not connected, see if there is a steel plug screwed into the cat or the pipe right behind it, someone may have removed it.
Sep 1, 2009 at 2:40 AM
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.