How can i clean my O2 sensor.......i thinks rite it is full with carbons.....

 

This goes back to the old saying "if it isn't broke don't touch it". Carbon on it? What do you think happens when you put something in the exhaust stream ?

 

rite now my air/fuel ratio meter not working as usual....not so stable......crazy.

is it cause of O2 sensor malfunctions?

 

if you're talking about how it fluctuates back and forth on idle and partial throttle, then the answer is no. the reason it fluctuates back and forth is because of your ecu being in closed loop mode. at more than about 65% throttle, it should make up its mind about which led to light up. or just use hondata or uberdata to disable closed loop altogether, it won't fluctuate at all with CL disabled.