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A few weeks ago I had a flashing Check light on my TOD system to go off. I put the 4WD system through its paces and the flashing TOD light went away. Just a cuople of days later - the check engine light came on and I took the Trooper to an auto parts store and got the following readings:


P0128 - coolant temp always low


P1404 - EGR valve stuck


P0405 - voltage signal EGR sensor A too low


I replaced the EGR valve about 12 months ago. - Is it possible for it to go bad so quickly?


Am I dealing with an electrical problem? a short circuit or something?
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