I'm stationed in Okinawa Japan. I recently swapped out my pipes on my 2007 Nightrain with some V&H pipes. When I did that the check engine light came on. I ran the diagnostic check and it is telling me that the rear 02 sensor is the problem. I pulled the pipes and 02 sensor off and check all the connections, even under the battery. I put everything back together but my check engine light came back on and when I ran the diagnostics check, it still shows the same problem. I guess the 02 sensor got bunged up when we pulled the pipes. My problem is that there is only one Harley dealership here on the island and they don't understand english very well and everything in there is twice as much as in the states. Anyway's if any of you know where I can order an 02 sensor from I would appreciate it.