Guys, Here is what I've learned. Service code is 13. Holding top button on dash for 2+ sec (when ignition is on) will display the code.
code means: Intake air temperature sensor malfunction, wiring open or short
So my guess was right. I let the engine run for few seconds when airbox was out.
Now question is, how can I turn it off?! Service manual says:
○When repair has been done, yellow engine warning indicator (LED) or red warning indicator (LED)
and immobilizer warning indicator go off and service code is not displayed.
The service codes stored in memory of the ECU can be erased using Kawasaki Diagnostic System
I have been riding it for some time and engine light is still on. So I guess should take it to dealership :-(