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what is the most common fix for code p0451?

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Replaced fuel cap and re-set obd-II by disconnecting neg. battery cable. Code remained off for approx. 1 week and has now returned.

Vehicle: 2008 Pontiac Solstice GXP 2.0 direct injection turbo

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Most likely the fuel tank pressure sensor is not read correctly, on most cars they are connect to the EVAP canister which is under the car near the gas tank.

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