I've read about checking the ecu codes especially the blinking light for short and long. Eg, 21 - long-long-short pause. But how about 30? The first three will be long definitely, but not sure about the zero. Anybody can comment on this!

 

the number 0 doesnt have a blink pattern. If its 30 there will be 3 longs only.

 

Thanks for the comment but how do i know it's 30 not just 3?