My 2014 F350 dually only has a "limp" mode if the def fluid level gets down to less than 1 gallon remaining. It's a 5 gal tank which is usually good for around 1500+- miles before I get "low def" warning.
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Richard & Judy Blackwell
Indio, Ca.
2014 F350 DRW 4x4 Diesel
2013 3402RL
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