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I can only tell you what I know.. 1994 model have some problem with ECU not much we can do here..

141. front knock sensor.. 1994 have deffect bad connection for front knock sensor volvo have a up grade kit for $80 without labor it come with 2 sensor both front and back.. ... >>>> now I do the up grade kit on my car it last for 2 week and code 141 come back and never go away not much I can do..

so up grade often will not solve 141 code..

now dealer tell 2 week ago since we all know 1994 have some ECU problem when it come to clear the code.. the best way to remove it from memory completly is to disconnected the battary over night and reconnect next day .. this action will clear code 141 if this is the memory problem... I have done mine yes but plan to do it soon..

the rest off the code are all balonie just clear them and forget them 99% it will never come back again..

my engien check light is on all the time .. many people just put a piece of black tape over the light and forget about it.. if the run good why worried..

as for code that you can not clear wall away come back few day later it will clear for you this happend to me all the time... some thing the 93-95 years small little bug...

go to www.volvospeed.com great site for 850 owner car...how to repair...