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Home >> Pontiac >> 2008 >> Grand Prix GXP >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 5.3L - DTC P0420 To DTC P3449 >> DTC P1400 >> Circuit/System Verification
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Circuit/System Verification

  1. Allow the engine to cool.
  2. Start and idle the engine for at least 2 minutes.
  3. DTC P1400 should run and pass.
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