How do I reset my 2003 chevy cavalier computer?

Resetting the computer in Your 2003 Chevy Cavalier is something You may have to do whether You are trying to clear a fault code or attempting to cure an abnormal behavior. The easiest way is to disconnect the battery for around 15 minutes. This gives the electronic components enough time to fully drain all power and therefore lose all stored memory. This also applies to Your radio stations, so write them down if You are worried about losing them. You want to disconnect the negative terminal only, not the positive. The only other way to reset the ECU is to physically disconnect the wire harnesses that plug into it. This does the same thing as disconnecting the battery but only affects the computer.