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Originally posted by 1997 GA16DE
I thought so. I am thinking either my O2 sensor,
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Very probable. Has been known to increase fuel consumption. Change it.
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something wierd with my ECU,
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Very unlikely. Usually if it fails you get Check Engine Light and you KNOW something major has gone down.
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or my driving. BTW, that's my highway miles too.
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Highway eh? Unless you are full of speeding tickets it is not your driving.
Chris