I have a 2006 F-250 with the 6.0 Powerstroke diesel. I had the big repair done about 25K miles ago. (New head bolts, and a bunch of new lifetime parts etc. Nearly $7000 altogether at Left Coast Diesel) The truck now has about 171,000 miles, and the check engine light has come on again. It came on yesterday after sitting mostly idle in the Tahoe cold for a week. It still comes on though now in the relatively warmer Discovery Bay weather. Any ideas on what it could be? May try to get it hooked up to a computer today to see what codes it is throwing.
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