Yea, dumbass me ran a can of fuel injection cleaner through it. I probably have clean injectors but it sure was hard on the O2 sensor. After I ran that F.I. cleaner through it the check engine light came on and I got the #12 code which is indicative of a bad sensor.
BTW I am assuming that the FI cleaner did the O2 sensor in. In reviewing the service records the O2 sensor had never been changed (84,000 miles) so it may could have been coincidence.
'97 Honda CR-V