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i am a for diesel tech i have an 04 6.0 i welded my valve shut if you think of it like blowing in to a bottle if the valve is shut and not flowing the gas will not flow through the cooler and too much flow from the egr valve is what ford is relating the egr cooler failers to due to the statige from the iat2 sensor the check engine will not come on due to this but po401 and po404 will be stored in the pcm ford master tech and deisel tech
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