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2011 Cab& Chassis CEL on lie o meter climbing

hd99fxr3

By hd99fxr3,
in 4th Generation Ram

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hd99fxr3

hd99fxr3

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Friends 2011 4500 has an intermitant CEL, when it's on the lie o meter MPG improves about 25-30%. Plan on taking it to pull the codes but was just wondering, how the two could be linked? In other words why the improvment in mpgs when the CEL is on?

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