Check engine light came on at 145,252 miles on my 2000 4.0 TJ. Its running just fine as normal.
I found the info below in another TJ thread. Will that work on my 2000? Where can I find what the codes mean? The link below doesnt work.
here´s a manual how you can find out what´s wrong with your jeep
read out the error code and you will know what´s wrong:
1) Turn the ignition key ON THREE TIMES in succession:
ON : OFF : ON : OFF : ON
(within FIVE seconds)
2) Count the number of times the check engine lamp on the dash flashes. The number of flashes represents the error code. There will be a short pause between the flashes representing the different digits of the code. Longer pauses separate individual trouble codes
3) Code 55 will be the last code to be displayed.
here is a list what all the error codes