What triggers a check engine on?

  • Thread starter Thread starter Jack
  • Start date Start date
J

Jack

I have my ODBII back ordered but for now I'm curious to know what triggers
the check engine light?
 
i think a number of "issues" will trigger
the light...i believe you need the reader
to fig out what or which issue (50-100 potential
issues...i think) caused or triggered the info
light.....the service light is triggered by
miles driven.....
 
Any number of things can cause the check engine light, from a bad O2
sensor to a cracked fuel cap (or one not on all the way). This makes
an ODBII controller all the more necessary.
 

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