under the driver side of the dash, it is a square 6 pin connecter
it means end of codes is all 55
Sorry, only a scanner can retrieve trouble codes on OBDII vehicles.....
HO2Sensor
Have vehicle scanned to determine the problem - most auto parts stores will do this free
Check Engine code of P0404 (EGR)
You need to test the wires at the map.
evap system
The plug-in for a code reader on a 1990 Dodge Dakota is located under the hood along the firewall.
Faulty fuel injector.......had to replace 2 on my 2000 Intrepid...Good Luck
P0731 Gear I Incorrect ratio
cooling thermostat
The airbag computer has detected a malfunction and set a code.