P CODES (POWERTRAIN) P1600 - P1699 P1624 Questions

Check Engine Lights On, I Used My Basic Code Scanner And It Says P1624 And The Book Says The First Number "1" Means Manufacturers Specific....

P0172- Fuel System Too Rich Is This Just Bad Fuel Or Could This Be Something Else? P0326- Knock Sensor 1 Signal Out Of Range What Does...

The Car Got These Codes P1624, P0734, P0722, P0755

I Have Had Two Coil Packs Replaced And Two Fuel Injectors Replaced Along With The Fuel Lines. Do I Need A New Computer Or Just To Replace...