P0300: Random/Multiple Cylinder Misfire
P0301: Cylinder 1 Misfire
P0302: Cylinder 2 Misfire
P0303: Cylinder 3 Misfire
P0304: Cylinder 4 Misfire
P0171: System too Lean (Bank 1)
P0172: System too Rich (Bank 1)
P0201: Injector Circuit Malfunction (Cylinder 1)
P0202: Injector Circuit Malfunction (Cylinder 2)
P0203: Injector Circuit Malfunction (Cylinder 3)
P0204: Injector Circuit Malfunction (Cylinder 4)
P0420: Catalyst System Efficiency Below Threshold (Bank 1)
P0455: Evaporative Emission Control System Leak Detected (Gross Leak)
P0505: Idle Air Control System Malfunction
P0513: Immobilizer Key Transponder Not Programmed or Damaged
It's important to note that these are not exhaustive, and there may be other codes that can trigger the check engine light in your 2002 Dodge Neon. To accurately identify the cause of the illuminated check engine light, it is recommended to have the vehicle diagnosed by a qualified mechanic using a scan tool.
