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EGR valves were very common by the mid 70's, and at some point about that time almost all manufacturers started using them in order to meet the...
P0401 is Insufficient Exhaust EGR Flow. I owned a auto repair shop for a few years and saw that code often. And that code will turn on the CEL....
I can confirm that no codes are thrown for a clogged EGR. My 2010 (with 180K miles) was shuddering/shaking badly. It started about 5K miles ago,...
