Oxygen Sensor Replacement How many are there?

1994 MERCURY COUGAR
90,500 MILES
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MIKE4444
  • MEMBER
  • 4 POSTS
Where are they located, Is it possible to tell which on is bad ???? It started running rough and the check engine light came on. I had the codes done at Auto Z and they told me to replace the O2 sensor but which one I asked and he did not have an answer....
May 3, 2012 at 2:13 PM
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KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
The trouble code should tell you which one. What was the trouble codes retrieved? You have two or three o2 sensors
May 3, 2012 at 2:27 PM
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