[HEMIDAZE]

First off, a check engine light does not mean you need an oil change. Take it to autozone and have the code read. The on, off, on works but you get a digital read out of the code on the odometer.

OBTAINING DTC'S USING IGNITION KEY

1. Cycle the ignition key ON - OFF - ON - OFF - ON within 5 seconds .
2. The odometer will show the P-code for the DTC code number. Refer to the DTC chart for a detailed explanation of the DTC codes.
3. If no DTC's are present, the cluster will display one of two texts: "P1684" and "done" or only "done".
   • "P1684" is only a status and indicates that the PCM memory has been cleared within the last 50 ignition cycles and does not indicate a problem.
   • "done" indicates that NO DTCs are present and the procedure is complete.