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Yes, having the codes P1393, P1391, P1395, and P1396 can contribute to poor diesel mileage. These codes typically relate to issues with the engine's timing, camshaft, or crankshaft position sensors, which can affect the engine's performance and efficiency. When these components are not functioning correctly, it may lead to incomplete combustion and reduced fuel efficiency, resulting in poor mileage. It's advisable to diagnose and address the underlying issues associated with these trouble codes.

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2w ago

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