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The check engine codes P1176 and P1177 for an Audi A4 V6 typically indicate issues related to the fuel system, specifically involving the fuel trim or air-fuel mixture. P1176 refers to a rich condition in the bank 1 fuel trim, while P1177 indicates a lean condition in the same bank. These codes can result from factors such as vacuum leaks, faulty sensors, or fuel delivery problems. It's advisable to perform a thorough diagnostic to pinpoint the exact cause and address it accordingly.
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