Readiness monitors
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Joined: Apr 2013
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Readiness monitors
I have a 99 f-150 4.6 2wd. My mil is lit and the code is egr insufficient flow. My question is why are 5 of my readiness monitors reading incomplete? The battery has not been disconnected in 3 months, I have driven 4000+ miles since then, of all types of driving. Would the egr code cause this?
the monitors reading inc. are:
catalyst
evap
oxygen sensor mon
oxygen sensor htr
egr systems mon
Any info or suggestions would be appreciated!
the monitors reading inc. are:
catalyst
evap
oxygen sensor mon
oxygen sensor htr
egr systems mon
Any info or suggestions would be appreciated!
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So i reset the code and checked the fuses, all fuses were good. I went for a drive to see if the code would pop back on like it normally does immediately after clearing it. It did not. I drove about 40 miles and the o2 monitors switched to ok. the only monitors still on are catalyst, evap, and egr. I wonder If the altitude has made the difference. I lived in wisconsin and the code would keep coming back. Now I live in nevada at a much higher altitude and the code wont pop on. I guess I keep driving to see if the rest of the monitors reset, or the code pops on. I only need one more to switch on to pass smog!
Lead Driver
Joined: Sep 2006
Posts: 7,907
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The Evap monitor will be on for quite some time because it's diagnostics are quite involved.
If there is a code involving the EGR system, it is a trouble to be repaired so it's monitor won't clear until fixed.
Otherwise it sounds like everything is normal.
Good luck.
If there is a code involving the EGR system, it is a trouble to be repaired so it's monitor won't clear until fixed.
Otherwise it sounds like everything is normal.
Good luck.
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