Hi all, I have a Honda civic 97. The check engine light came on last week. Wen to the nearest autoshop and was told the O2 sensor #2 not working. I called the local Honda dealer and they said it might still be unde warrenty. Does anyone know how to check if this part is still unde warrenty? Some people told me the O2 sensor is not that important and I don' have to repair it. Is that true? That you for your help