I'm getting code's 1 and 20, well I think 20 but its kinda funny, I thought for code 20 it would give me 2 long lights, but it gives me 20 short lights, so i'm assuming that its code 20, I was not getting this code until I fixed the interior lights dash, tach, turn sig, and all that. I have another main fuse box from a 90 si hatch back I could put in but I'm not sure that's the problem. I'll check the connection to the oxygen sensor, and hopefully thats not connected and thats why I'm getting the code for that. Any other tips on the eld code 20? My car is a 89 civic si, with a d15b7 engine, and 90 tegge front end.