1996 Lexus SC300 Q&A

1996 Lexus SC300 Question: Car will throw fault code p0401 only after fueling but not everytime.

Changed egr valve vac Modulator and ox senors. I even changed gas cap. -
Answer 1
THESE CAN BE VERY TRICKY, DID YOU CK PORTS TO SEE IF THEY ARE PLUGGED WHEN EGR WAS OFF. YOU MAY ALSO HAVE A SENSOR ISSUE -