1997 porsche boxster i have trauble with code #1124 o2 sensor enrichment bank1 sensor 1 i had replace o2 sensor on bank 1 primary sensor,and do smoke test .no found leak . it hapen only on bank 1, then i check for exhaust leaks ahead of catalystic convertor. there no found leaks . anyone know please advice me what to do thankyou very much
