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1994 Mazda B3000 O2 sensors

Tiny
TURBOACC
  • MEMBER
  • 1994 MAZDA B3000
  • 6 CYL
  • 4WD
  • MANUAL
  • 175,000 MILES
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?
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Monday, August 31st, 2009 AT 9:26 PM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
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.
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Tuesday, September 1st, 2009 AT 2:40 AM

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