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I was getting the count down from 500 miles to empty on my def level. Today I started my truck and the count down was at 450 miles to empty, as I pulled away from my house, about 500 yards, the count down went to 99 mile to empty and limp mode.
I haven't, but I no longer use DEF. The DEF level in these trucks is currently not able to be accurately monitored. That's all I can tell you. There's so full it has spilled all over you, half and "oh crap you are out and limping along". Best I can tell you is fill it up and it will reset eventually and you will be fine. It's a huge gripe from a lot of people.
Going to take it the the dealer on Tues. and let them figure it out, they told me Ford fills the DEF tanks full so I paid for it and they are going to do it right.
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