What are the best Chevrolet repair shops?
RepairPal Certified shops can diagnose and repair your 2003 Chevrolet Impala. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Oops! We got lost!
Your location cannot be detected. Please enter your zipcode for nearby shops.
401
A P0401 is an Insufficient EGR flow code. have you checked the EGR ports for carbon build up? You probably are not getting vaccum to the EGR valve.