Well i have trouble codes 13 and 32 i am hearing i have two oxygen sensors on this ramcharger is a 93 with a 318 V-8 and shes a 4wd. i know where the one that plugs into the exhaust pipe before the cat is with the black 4 wire sqaure connector is but where is the other one. can anyone explain this or get pictures for me please. and the other fix i was told check all my vaccum lines for leaks and cracks. and since i have replaced the egr valve and egr tube the last thing on the list is the erv soleniod. so if anyone could get any pix of where all the vaccum lines go and that sort of thing that would really help out. but thanx for your time and hopefully thanx for your help.