Well guys I have finaly solved the age old Q about a code 91 c .Warmed the car to operating temp suht it down and did a KOEO test and good ole 91 poped up so I drove the car up on a set of ramps let it cool after a few hrs I went back out and pulled both sensors picked the best one outta the pair and put itin the RH side and installed a new bosch o2 sensor 47.99 in the LH side fired her up backed her off of the ramps and went down the road to warm her up before the check eng light would come on after 15min on the road and I drove around for about three hrs and nothing
came back home and did a KOEO test and a KOER test and no code 91 c to be found!!!!!!!!!
oh and by the way its a 1990 lx hatch 5.0 stick[sm=happybounce.gif][sm=happybounce.gif]