friend of mine has a check engine light on and i wanted to help him. On the 88-91 crx/civic they are under the carpet where you put your feet on the passenger side and have a led on them you can read error codes. on the 98 civic under the carpet is rubber padding thats fastened down with snap in plugs and stapples so doesnt look like its there and doesnt look like its under the seats either. If anyone knows where they are located on this model it would be much appreciated.