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  1. DragTriper

    KOER 41 & 91 won't go away after changing O2 sensors

    Hi Guys. I'm getting a little bit frustrated trying to solve this. I got an 89 5.0 liter and I have codes 41 & 91 (No HEGO switching detected always lean (right side).& HEGO sensor circuit indicates system lean (left side)). I changed both O2 sensors and the car is running much better with...
  2. DragTriper

    KOER Code = 41?

    I'm wondering if anyone here managed to clear the code 41 on their mustang and how they did it. I got an 89 5.0 liter and I have codes 41 & 91 (No HEGO switching detected always lean (right side).& HEGO sensor circuit indicates system lean (left side)). I changed both O2 sensors and the car is...
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