i have two codes po,160 an po, 140, engine light is on .

what does these mean for me , i just got the truck an i see it has no stock exhaust, i see what looks like headers pipes, off the manafold into a muffler out to the side of the truck... i can see a sencer at the end of the header pipe, ?

Check to see that the rear sensors are there and plugged in (you should have 4 sensors total)

thank you very much.. i only see two sencer one on both sides at the end of the header pipe, are you telling me the two sencers are no good, ? how can i know they r no good ,, ? and the truck seems to be running rich if you will, will this hurt the moter?...