code-p0457

Question

fuel cap replaced,all connections checked ok and fuel pump retaining nut tightened defect not cleared

Answer 1

Hi there,

If you performed a smoke test on the evap system and there aren't any leaks, then investigate the pressure sensor as a possible cause. If the sensor has failed or doesn't see a change in the pressure, the computer will code it as a leak in the system. Also, if the vent control valve is stuck open the same thing could happen.