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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Changed egr valve vac Modulator and ox senors. I even changed gas cap.
(1) Answer
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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
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