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Message: [QUOTE="JD3020, post: 1439267, member: 373"] Signed the papers on a clean 1 owner '14 with 54k miles today. Truck is spotless, and has obvious signs of being babied its whole life. Local truck and theres maintenance records for it. I've actually put close to 400 miles on it this week. We originally test drove it Monday for a while, negotiated the price Tuesday, Wednesday got a call that after it was detailed it was in limp mode. I've never been able to talk to the tech but from what i've gathered from the paperwork and what not they got water in the EOT plug when they washed the engine and it freaked out. Replaced the pigtail(i have paperwork for it) and its been fine. To make things right i actually picked the truck up yesterday and put 200 miles on it, and then put another 150-200 since i bought it. Truck has ran absolutely flawless the entire time. Spent most of the day hooked to a trailer and its blown me away how smooth and powerful the 6.7 is compared to any of my 7.3's or 6.0's. Unhooked the trailer and then put some more miles on it tonight going to dinner and doing some stuff for my birthday. At one point when i started the truck tonight there was a message saying i only had 500 miles of DEF left, ignored it and went on. Little while later i started the truck up again and now it said 480 miles of DEF left, which i'd probably gone 20 miles or so. Again thought nothing of it and went on. Even later i hopped in and never got a message. So after probably 20 miles on the highway i noticed the CEL was on. Went into the screen and it says DEF level is OK, which not but an hour or two ago it was telling me it was low. Still the truck hasn't missed a beat and starts up as soon as you turn the key, no noises or anything. So does it sound i'm having a issue with the DEF sensors? The truck is "certified pre-owned" which i was told means it has a 12 month/12k bumper to bumper warranty starting today, plus the rest of the factory engine warranty. I'd like to ****** it simply for MPG's, but planned to wait a little while. Not even sure if my AutoEnginuity will pull codes on this thing to check it out, and don't really have time right now to take it back to the dealer. Just looking for some input before i stress myself out. Haven't even owned the truck for 12 hours at this point. :fustrate: [/QUOTE]