I have a 2004 Audi a6 2.7t. I have recently changed my Bank 1 sensor 2 because i kept getting Open circuit code p1118 heater core open circuit. After i changed the 02 sensor i noticed the code is still there it is an oem bosch 02 sensor. I changed the back sensor connectors to the opposite sides but it still show open circuit to b1 s2. I really need help with this i cant pass inspection because of this issue and i haven't drove my car in 2 months because of it. I took it to multiple mechanics but they all have different opinions but none of them actually did anything to fix my issue.