Rear O2 sensor high, Does that mean I need to replace it? just under 37K miles

 

bump up

 

Are you running a PC? If so, have you tried re seating the ECM to power commander connectors? Should be simple, pull up the instruction on the dynojet website. I doubt the sensors went bad, the o2 sensors are not even connected with the powercommander if correctly intalled. Power commander could have died too. When you re-seat the connectors try a little dielectric grease, it helps.

Here is the link to the install instructions, it has good pictures and should be simple to re-seat the connectors. http://www.powercommander.com/downlo...ngI814-511.pdf

 

No PC, have the 103 download. I just returned from high elevation 12K + in Colorado, wonder if that could make it throw a code? Our elev. at home is 160 ft. I cleared it to see if it comes back.

 

Possible. Everything I've seen on this code is usually related to the connections to the PC or Fuel Pack. Yeah, clear the code and see if it doesn't come back.

 

I see that you also have an 09 CA bike. Similiar thing was happening to mine. I would get the high O2 readings, sometimes front, sometimes rear. Also, more troubling, my bike would sometimes die when I came to a stop, which seemed to trigger the high O2 faults. After a long time and a lot of troubleshooting, I determined that it was caused by the CA emission components that the MOCO installed. In CA, our bikes have an emissions canister that stores fuel vapors. In all other states bikes, these vapors vent to the atmosphere. But in our CA bikes, they are stored in the canister until the ECM triggers the purge valve to open up, at which time the vapors are routed back into the intake manifold to be burned in combustion. The problem is that during the time of purging, the bike runs rich. And for whatever reason, it looks like the ECM's strategy is to have the purge valve open during idle just before the motor reaches full operating temperature. Thus it caused my bike to stall just like clockwork about 2 miles into my commute home every evening.

Dealer could not find anything wrong. I ended up completely removing all of the CA emissions stuff, including the canister and purge valve. I now have my tank vented directly to the atmosphere, just like all non-CA bikes. I also has to cap off the purge valve electrical connection with a resister cap so that I don't get any DTC's. That was about 18 months ago, and I have had absolutely no related problems since then.

 

Unplugged the sensor put dielectric grease on the pins, cleared code, went for a ride, no code came back. Guess it's good ??

 

Just one more shining example of how CA politicians are building
a greater tomorrow one regulation at a time

 

It it works....don't fix it!!!

 

that was supposed to be "IF" it works ...dont fix it!!