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Discussion Starter · #1 ·
I've had both the upper and lower sensors replaced and the check engine light comes back on by the end of the day and the miles per gallon drops drastically. Does anyone have any insight on what might actually be wrong?
 

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Discussion Starter · #3 ·
What codes are you getting? The gas mileage dropping when the MIL is lit will be because it's in a limited-power "limp" mode with fixed valve timing.
Thanks! I just heard from the dealership and there's a crack in the exhaust manifold. Further research unearthed a technical bulletin about this very issue. Now to research if I can get any of the $1800 back I'm about to pay - Brenda
 
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