funny you mention this. i've been getting a check engine light in my liberty, on and off, for the last year or so.
my first inclination is to ignore it and see what happens. the check engine lights are notoriously unreliable and can be set off by petty mix ups with the sensors and whatnot. always trust your mechanical intuition first and computers second. in my case, car was in great shape (personally maintained) and running really well. it still comes on every once in a while, but the car has been awesome with no problems. go figure.
sometimes i think they're designed to go off arbitrarily to rake in the cash. it's cool that autozone offers that survice.
WE AIN'T NOWHERE WITH THIS BUM CHOKER IN CARMELO. GIVE ME STARKS'S 2-21 ANY DAY OVER THIS LACKLUSTER CLUSTEREFF.