If you have a engine code p0203 on a 2000 dodge neon how do you fix it?

Trouble code P0203 means: Injector Circuit / Open - Cylinder 3 I think you need to replace the Injector on cylinder 3 ** Remove the air intake snorkle that covers the #3 and #4 injectors. On the bottom of the snorkle you should find a metalic pad. Now, look at the wires that feed the #3 injector. If the injector is turned to just the right position, the wires can rub on the metalic pad. If it wears enough it will rub through the wire insulation and you will be able to see copper stranded wire as a result. To repair this, place some automotive-type silicone gasket maker (in a tube), covering the bare wire and then allow to dry for 24 hours. Also, turn the injector 45 degrees (either right or left) to move the wires away from the metalic pad. This will effectively lower the wires so that they won't rub. Another thing that could be done is to add a 1/4" spacer under the snorkle bracket on the front locating stud. This will also increase the space between the bottom of the snorkle and the #3 injector wiring harness/connector. If this doesn't fix the problem then it's probably your injector.