Is there any advantage to putting O2 sensors on a 2003 Road king? I may replace my entire exhaust and was wondering if in fact it will help or even work. PC5 has auto tune I believe if you have the sensors. Am I correct or have I heard something wrong.

randy

 

Wide band sensors can be tremendous improvement if your ECU supports them. Standard narrow-band sensors no so much.

 

There are three ways, that I can think of, to add O2 sensors to your bike.

The first way is to replace your motor, ECU, wiring harness, etc. with newer versions and add the O2 sensors with it, as the newer ECU will support the O2 sensors.

The second way would be to add a tuner that can utilize O2 sensors, such as a PowerVision or Power Commander (either with the auto-tune module).

The third way would be replacing the ECU with something like a Thunder-Max, which comes with it's own O2 sensors.

Your stock ECU can not use the O2 sensors on it's own.

Personally, I opted for a PowerVision with auto-tune module on my 02 Road King, and I've been happy with the results.

 

Yes, ThunderMax comes with wideband sensors and works in closed loop mode at all times, this is why it is so efficient providing the max power when needed and max economy when going easy.
Narrowband sensors used with stock ECU allow controlling low and mid speed cruising only. When the throttle is opened a little more it drops into open loop mode and uses canned maps.

 

on my 04 stock bore motor I have the PCVwith Auto tune and love it. Bike runs just superb