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This system doesn't continually run the Diesel Exhaust Fluid (DEF) through as a constant cleaning process. Once the Diesel Particulate Filter (DPF) starts to clog from exhaust soot, it send a signal for the emission system to "REGEN" which starts the cleaning process automatically, using the DEF. You must maintain a steady or higher speed of 45MPH over a given period of time for the process to complete. In most cases, you'll never know this is going on. Some vehicles state it on the cluster so as to advise you to keep running. If you do short trips or let it sit for long periods without running it either doesn't get the "chance to dance" or the DEF fluid goes bad, not cleaning the DPF...resulting in above condition.
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Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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