CobaltSS[303]

Ok, my car has been acting up lately as you know if you read the thread i posted earlier this week. I thought it was the "crank shaft position sensor" but i took it to AutoZone to see what codes were making my check engine light go on. I was woundering if anyone could help me with this and let me know what these codes are exactly and what is basicly wrong with my car.

CODES

p0461
p0603
p0171

I appriciate any help given!

Witt

First code is saying your fuel level sensor is bad. Second is saying something erased the long term memory of the PCM against its will. Third code is saying your PCM is correcting fueling calculations in excess of 20% for additional incoming air that hasn't been metered/measured. (larger diameter aftermarket intake pipe or leak in the pipe will cause this)

CobaltSS[303]

So is the pcm my ecu? and what do you think is broken on my car?