So I replaced the front o2 sensor replaced the exhaust gasket and the light still comes on what could it be? I've looked online and some say an exposed wire but I wouldn't see where? By the cpu or not sure where exactly or any other solutions would be great. Also would that affect my riding in any way if the light is still on?

 

first thing I would check is the end of the plug that is attached to bike side of the o2 sensor .. your HD repair manual will tell you how to remove the wires/pins from the plastic housing so that you can give them a real good testing and look see..and then work your way back from there...but it is probably just a bad connection at the plug for the sensor and a good cleaning of the pins and a dab of grease will fix it...

 

After you carefully inspect the connectors on both sides.

Have you checked for an intake manifold or head gasket leak causing the lean code?


Dirty/stuck open injectors: The vehicle may run lean
(dirty/clogged injectors) or rich (stuck open injectors) if
there are injector problems. This could also cause poor
fuel economy and performance.
• Loose O2 sensor: If an O2 sensor is loose, engine performance
may be affected. This could also show up as a
slow changing O2 sensor voltage.
• Loose/leaking exhaust: This can cause a poor ground
connection for the sensor or allow fresh air into the exhaust
system. If fresh air enters exhaust system, the O2 sensor
will read a lean condition, causing the system to go rich.