Ok had some issues with a faulty O2 sensor which have been corrected from a previous post. Now at random when you turn the key on the car will do a self test (KOEO) like when you have a jumper in the harness. sometimes when you crank the car up it also will go into self test (KOER) ie: 4 quick flashes on the CEL followed by increase in idle etc. What could be causing it to do this with no jumper inserted in the harness?? One other weird thing after installing the new O2 sensor was the air/fuel gauge doesn't read anymore, just wondering if the 2 could be related. Have no codes showing.have also disconnected the negative cable thinking that would help but no go. Any ideas