What would cause the check engine light to come on after 15-20 miles in a 94 new yorker engine runs fine turn off and on same thing?

Answer 1

{| |- | http://www.alloemcarparts.com/specials/nissan_oxygen_sensor.html

I just found this from the other site saying, when it comes with (for example)Nissan oxygen sensor, check engine light is on because the computer has detected a problem with the emissions control system. Unless you fix whatever has caused the computer to set a fault code, it will come right back on. Depending on the model year of your vehicle and weather it is an OBD1 or OBD2 system, disconnecting the battery for a few minutes may reset the light, especially on an 1995 and older OBD1 system. Rarely will this work on a OBD2 system. On an OBD2 and some OBD1 systems, you need a scan tool to reset the light. Take it to any auto parts store and see if they will scan the system for you, free of charge. Depending on your state, they may accommodate you. The code they find will help to determine what is wrong. If you purchase the repair parts from them, they may reset the light after you make the repair. One thing to do before any of this is to check your gas cap. A loose gas cap will set the light. If you find that it was loose, tighten it, (3 clicks). The computer will turn the light off after a few driving cycles if that was the problem. |}