I had 3 codes on my friends windstar. Bank one and bank 2. insufficient flow. I reset the codes, and what do you know, the light is back on. Threw my reader on. now its only one code. "P0401 exhaust gas recirculation. -insufficient flow detected." What is this caused from? i thought it was gas flow, gasoline, i read it wrong, so its exhaust gas going back into the engine?
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