car runs lean...

90mustangfan

New Member
Oct 18, 2005
93
0
0
So cal
Heres the situation.. Ive been getting codes 41 and 91 for KOEO and KOER....
KOEOR: 41-No hego switching detected running lean (right side)
91-hego sensor cuircuit indicated system lean (left side)
Contienus memory: 41-Hego sensor indicateds system running lean (right side)
91 no Hego switching dected always Lean(left side)
I just replaced my O2 sensors, i checked the wiring all the way to the computer, thats good.It says the car is running lean, I replaced ALL vaccum hoses and hooked them up correctly, it has good vaccum 15hg at idle...What puzzles me is that the car runs great....Any ideas on whats causing it to run lean or why I keep getting these codes...I need to get the check engine light to stop coming on and I need to take it to a smog shop so I can register it...