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Ford TaurusAlong the way, Ford has made some 500 changes to the Taurus, changes that were already scheduled for the mid-cycle freshening of the Five Hundred. The general body shape of the new Taurus is the same as that of the previous Five Hundred, a large, front-wheel-drive family sedan, but almost everything else has changed for the better.
Tee a vacuum gage into the EGR valve feed line from the EVR. Unplug the EVR electrical plug and rev the engine a few times. If at any time you get vacuum on the gage, the EVR is leaking through and needs to be replaced.
Try not to replace everything - that gets expensive.
I have the same P0402 code and replaced EGR valve, DPFE sensor, EGR soliniod and still have the same problem and can get the car to pass inspection. I'm thinking it might be a vaccum problem.
Anyone know how do you find the vaccum problem???
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P0402 -- Exhaust Gas Recirculation Flow Excessive 
Linear Mode
