For a Buick Enclave, the engine codes mean the following:
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P0642: This code indicates a problem with the sensor reference voltage circuit.
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P0451: This code points to an issue with the evaporative emission control system pressure sensor range/performance.
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P0457: This signifies a leak detected in the evaporative emission control system, specifically related to the gas cap.
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P0193: This code indicates a high input from the fuel rail pressure sensor.
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P0195: This code suggests a high input from the fuel temperature sensor.
These codes may require diagnostic testing to pinpoint the exact cause and necessary repairs.
