my check engine light is on.so i did the self diagnostic test on it and I'm stumped.
the light flashes once pauses ,flashes 2 times, pauses then flashes 4 time before it gives the 55 code
so is it showing 12,4 as a the trouble codes or should i disregard the first flash and read it as 24 if this makes any sense
i also cant find out what 12 or a 4 code means
any ideas? the truck seems to run fine for having 200k miles on it