I would appreciate any tech help. I Have a 2000 honda Accord LX 4 cyl, auto. The Primary O2 sensor was located at the top of the headers and the secondary after the catalyst. I replaced the headers with one from Arospeed which only has an opening down below before the catalyst.I had also replaced the catalyst with an OBX hi-flo catalyst. I now have just the opening at the bottom of the headers before the catalyst and 2 O2 sensors. I tried attaching the one O2 sensor from the catalyst in that opening leaving the one that was at the top of the headers which is the primary not in use. This is causing my check engine light to stay on. Can I please get som help on what needs to be done. Will I need to lengthen the primary sensor in the top and actually make that one reach all the way down to the opening at the bottom of the header before the catalyst. But then now the secondary sensor will not be in use because there will be no where to place that one. Will that cause my engine light to go off. I would appreciate any help from the more experienced.