i have a 3146 code aftertreatment outlet temp sensor open or shorted to ground of course it intermitten everything looks fine noe but there are two filters on this bus the first one or the one closes to motor has three sensors one in front one in middle and one in rear the second filter has three also one in front one in middle and one on very tail end one the pipe part of the filter would the very last one be my outlet temp sensor i am i am figuring the first filter is the doc