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Home >> Buick >> 2007 >> Lucerne CXS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.6L - DTC P0351 To DTC P2440 >> DTC P0496 >> Circuit/System Verification
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Circuit/System Verification

  1. Start the engine.
  2. Seal the EVAP system using the Purge/Seal function with a scan tool.
  3. Observe the FTP sensor with a scan tool. The Fuel Tank Pressure Sensor parameter should be within -1 to +1 inch H2O.
  4. If the Fuel Tank Pressure Sensor parameter is within -1 to +1 inch H2O, the condition is intermittent.
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