Check the fuses.
what would cause my navigation system to quit
i have a 2004 Mitsubishi endeavor . i was wondering how often you would sugest replacing the timing belt .
Have the transmission serviced. My 05 endeavor did the same thing.
because one of the sensors detected a problem
I HAVE A 2004 MITSUBISHI ENDEAVOR, AND THE ONLY TIME MY CHECK ENGINE LIGHT CAME ON IS WHEN I FAILED TO CLOSE MY GAS CAP TIGHTLY. THE LONGEST THE LIGHT STAYED ON WAS FOR 3 DAYS AND THEN IT WENT OFF.
Dead cell in the battery or corroded or loose battery cables.
It could be the rear differential--there was a recall on this back in 2005--hope this helps
Bad ground on the brake lite circuit.
There is a battery in this system that would be overdue for replacement in a 2004.
Alternator
The owners guide for my '04 Endeavor says do not disconnect the battery I think, or the on board diagnostic record will be lost. maybe this would also clear the service engine light?
Possible ground issue at the taillights.