Dealer told me i needed both 02 Sensors replaced , so i did. 30 miles later engine light back on and no improvement in gas mileage . any suggestions ?
You need to get it to a dealer or other shop that has the diagnostic tools to accuratly diagnose the issue. You will spend more money guesing at parts than you will at getting the test ran. If you get a clear answer from the dealer come back and we can help you with any questions you have about what they said or how to make the repair, but trying to guess at your problem is not the way to go, there are too many things that can be the issue for anyone to give you a correct answer with out a diagnostic check.
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