13 When Harley coasted and rode, the fault light came on and the idle speed was normal.

The main reason why the engine fault light is on is that the throttle valve or the engine has too much carbon deposit, and the mixture ratio is out of balance after the oxygen sensor fails, which is easy to make the engine fault light on. If you drive at a low speed in the urban area for a long time, this phenomenon is easy to appear. Also pay attention to check whether there is any leakage in the fuel injector, which leads to the fuel injector still in the fuel supply state after the throttle valve is closed, which leads to the excessive mixture when driving at low speed, which leads to the unstable idle speed after the fuel is turned off, and even more seriously leads to flameout.