Westonci.ca is the ultimate Q&A platform, offering detailed and reliable answers from a knowledgeable community. Get detailed and precise answers to your questions from a dedicated community of experts on our Q&A platform. Discover in-depth answers to your questions from a wide network of professionals on our user-friendly Q&A platform.

While servicing a vehicle, you retrieve the diagnostic code P0401, "EGR (exhaust gas recirculatior flow insufficient." Which of these is the most likely cause?