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Re: Mercury Sable with a pesky P0401 EGR insufficient flow code
Posted to Technical Tips Forum on 10/24/2023 6 Replies

Used to clean out a lot of EGR ports on older vehicles like the one you worked on. I think it was the Ford 3.8 that had individual EGR ports for each cylinder, and they would progressively stop up until only one would flow, dumping all the EGR gas into that cy... Login to read more.

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