TOD LIGHT OFF - CHECK ENGINE LIGHT ON - Isuzu Forums - Isuzu Enthusiasts Forum

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Old 03-22-2008, 11:27 AM
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Join Date: Mar 2008
Location: United States
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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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