Code p0401, 2002 honda civic 4 cyl manual boughtvthe new egr valve twice lite comes back on before 50 miles
I have a 2002 Honda Civic. Manual for cylinder code reads p 0401 I bought a new one light. Came back on within 50 miles toOK it back, got another new one. Lite came back on with in 50 miles
Did you use OEM parts?
See other possible causes for P0401 here:
https://www.way.com/blog/p0401-code/
https://www.obd-codes.com/p0401