Why wont the monitors set?

2004 FORD F-150
130,000 MILES
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BIGMIKAL2006
  • MEMBER
  • 1 POST
I have a 2004 ford f150 and monitors wont set. Cat and o2s. Poss computer issue but what do i test?
Sep 17, 2012 at 3:05 PM
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SATURNTECH9
  • ✓Experienced Mechanic
  • 30,869 POSTS
If the thermostat is stuck open the monitors will not set. I would remove it to see if it is open.
Sep 17, 2012 at 3:21 PM
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