2000 Durango, shuts off bad mpg
#12
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You can check them yourself by turning the key from off to on (not starting the engine) and off to on again like 3 or 4 times and look on your odometer it should show the codes. I think the other way is if you hold down the trip reset button on your instrument cluster and turn the key to on while still holding the button down and keep it down untill you see "chec" in the odometer display, after the test it usually shows the codes. Or just go to autozone and have them scan it for free.
#13