On your 2002, you can get the code(s) yourself. Turn the key from OFF-ON-OFF-ON-OFF-ON. The code will be in the odometer window. Any codes which have occured will be in memory and will be displayed.
Flashing CEL means there is a problem that may damage the catalytic converter(s).
2003 TJ, 33" BFG AT, 2" BL, 2" BDS spring lift, Truck Lite headlights, Homemade sunrider top.