2003 neon code#p2503 - 2003 Dodge Neon

P0304 Code Cylinder 4 Misfire
The p2503 code is - charging system low output. If the engine ran ok before the radiator blew, then components and wire are probably still wet or moist. Especially with cylinder #4 , take off spark plug wire from spark and from coil and dry out the inside of the boots. Also, try blowing the alternator dry with a hair drier.

Its a low voltage code, either your battery is starting to Fail or the alternator is not charging enough.

run fault codes and check for cam/crank position sensors fault. Check that the cam is turning as it may have broken a timing belt.

Hi there:

P0068 - MAF/MAP Sensor throttle correlation

I suggest to check the snorkel going to the MAF (Mass Air Flow) sensor. Check for rips, cracks or if a tube has fallen off.

Hope helps.

Shift Solenoid A Malfunction

Here you go
Read all about it
Looks like a fuel vapor leak and a missfire
http://www.obd-codes.com/p0456
http://www.obd-codes.com/p0441
http://www.obd-codes.com/p0303

Sounds more like an alternator problem. Check output voltage of alternator, code P2503 indicates low voltage. Check/clean all connections at battery and alternator, as well as check all fuses/relays under hood in fuse relay box, just in case fuse blown as well. If all checks out good, you may need a new alternator.

CODE PO340 NO CAMSHAFT POSITION SENSOR CIRCUIT FAILURE.CODE PO440 EVAP PURGE SYSTEM FAULT.POSSIBLE CAUSE THE EVAP PURGE VALVE VACUUM SUPPLY IS LEAKING OR CLOGGED.OR THE EVAP PURGE SOLENOID HAS FAILED.

P0037 HO2S Heater Control Circuit Low (Bank 1 Sensor 2) (One of your oxygen sensor heaters is failing)
P1532 IMCC B: Circuit Malfunction (This is a code related to one of the two intake tuning valves (the bottom one) either the valve or the wiring could be at fault
P2503 Charging System Voltage Low

I'd get that checked to see which of these codes are currently "active" or still happening. Some of these might be inactive and I wouldn't worry about them until they come active again (if they ever do)

Except for the P2503, which could indicate a failing battery or alternator, and could eventually leave you stranded, the other two codes are pretty harmless in themselves. The oxygen sensor heater is used when the exhaust system is cold to fine tune the air/fuel ratio in the engine, and the intake tuning valves are pretty much used for the same reason (air/fuel ratio fine tuning). The worst case scenario for those is a lack of power and/or fuel economy...

change the crank sensor