Some more info go to the link and scroll down till you see the pdr with the 02 sensor
The purpose of this Service Bulletin is to provide
information to assist you in the replacement of both
oxygen (O2) sensors on affected 2001 GL1800/A
models.
Moisture in the exhaust can damage the O2 sensors.
Also, the right O2 sensor coupler can become
corroded which will result in a non-functioning
sensor.
A replacement kit that contains two new O2 sensors
is needed to repair the problem.
Only perform this procedure if the vehicle actually
experiences an O2 sensor failure.
http://www.goldwingfacts.com/forums/forum1/3906.htmlhttp://www.goldwingfacts.com/used1800.htm the pdr one