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I just had my CEL come on and its reading a U1510 and a U1501. I ran some Lucas Oil Fuel System Cleaner because I was suddenly getting 2-3 mpg less fuel economy. It's still dipping 4-5 mpgs today and with the light on I'm wondering if that stuff may have triggered something. Anyone have any thoughts or input. I was reading spark plugs could trip U1501, which I will be replacing anyway as I'm at 90k miles.

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