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Re: 96 Mercury Mystique with a PO401 EGR Code
Posted to Technical Discussion Forum on 9/6/2007 1 Reply

The plastic ones are crapping out too.

Ford has now changed the EGR system. They now use an ESM on newer Fords. An ESM is an EGR valve, 2 MAP sensors, and and EVR all in one assembly. They did it for "dependability reasons". They replaced the DPFE sensor for... Login to read more.

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