hmmmmm this might be a dumb question but i want to know the answer lol. what happens to the o2 sensor if you put flows on???? because i cant see mine and my VL runs perfect get 450kms out of a tank

AFM on a VL should be between 3.5v and 3.8v.

ok so... guys... whats the o2 sensor??

mine doesnt have it and it runs fine. but i have extractors and a straight pipe lol.....the joys of living in NZ.

The o2 sensor allows the engine to run in "closed loop" mode. When the engine is in certain states i.e. idle, cruising, light load, the o2 sensor monitors the exhaust gas then adjusts the amount of fuel delivered to acheive an air/fuel ratio around 14.7:1. When the engine is accelerating or under high load it runs in "open loop". The ecu has a base map which it uses to put in a set amount of fuel (dependant on other sensors, but not the o2). This is to reduce any chance the engine may lean out. So if your AFM is OK, a faulty o2 sensor will not cause an engine to run rough, but it may use more fuel.