check engine light that i? the check engine light which is now blinking.and from what i read that means something more serious is going on.sunday we changed the injector,and about a month n a half ago,i had a tune up,and an oil change.where we replaced all the spark plugs.the owners manual says to turn the key 3 times,to see what codes come up if any.the code that has come up is p-0203.i don't know what this code is referring to.does anybody know what this code means.all help is greatly appreciated.