So nicely put. LolDirectly behind the DEF tank is the dosing pump. The filter is hiding under a cap with a 27mm, 12 point head on it. You access it from underneath. You will get DEF in your armpit. Don't put any lubricant on the o-rings, just shove it firmly into the hole. Don't forget the butt plug, that gets stuck up in there too.
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It'll make perfect sense once it's taken apart.So nicely put. Lol