I recently installed a hotshot header, then blew the "battery" fusible link and replaced it. Now my SES light is on. I figured it was an oxygen sensor, since i have seen multiple posts about people having to replace one of these after a header install(usually just the front one). I stopped by autozone and the guy checked it and said there are 3 codes, one for both the oxygen sensors-front and rear, and code p1605, which is "A/T Diag Comm Line" I have no idea what could be causing that one. The guy said that since both o2 sensors were showing a malfunction, then it might be somethign wrong with the o2 heater circuit(if it goes to both sensors). Does anyone know what could be causing that p1605 code or how i would check to see if somethign is wrong with a heater circuit that goes to both the o2 sensors? I would just go ahead and change both o2 sensors, but those are kinda expensive. Thanks in Advance, Wes
btw my 1998 200sx se-r has 80,000 miles
btw my 1998 200sx se-r has 80,000 miles