p0301 code what is the fix?

Question

i replaced the coil and ignition coil
test the cylinder 1 compression and its good
new spark plugs
new injector
and still the check engine on
and some time the light flashing

Answer 1

did you use the factory spark plug?

I would check the coil and injector wiring next, if that is not the case check the timing 

info below is for a 09 Prius (2011 service manual not showing, if you are under warranty it should be covered by powertrain warranty)

 

you should get 9-14v