2002 Dodge Intrepid "reset timing chain tensioner 02" Questions

...knowledge as to slack on the timing chain goes on the return side of the chain to cam from crank, (tensioner side) reset your tensioner & pin before you install the chain tensioner. you can do

...reset the ecm/pcm... took positive terminal cable off and grounded it for 30 plus seconds, cranked the engine and then retreived the codes again. This time i got code 12 and code 55. once again 84-86 ...