The EGR valve position (EVP) sensor can fail on this vehicle. The EVP sensor measures the EGR valve position and transmits the date to the engine control computer. If it fails, drivability and fuel economy can suffer, the Check Engine Light will commonly illuminate.
EVP Sensor Failure May Cause Drivability/Fuel Economy Issues on Mercury Grand Marquis
Average mileage: 92,880 (18,800–150,000)
21 people reported this problem
8 people shared problem details
1992 Mercury Grand MarquisVisitor
Had it in the shop several time for the same EGR valve and light on
1997 Mercury Grand MarquisVisitor
Engine hesitates when accelerated
2000 Mercury Grand Marquis18,800Visitor
When you crank it up and put it in gear it will cut off
2001 Mercury Grand Marquis40,000Visitor
EGR pressure sensor (DPFE-4) failed. Replaced with new OEM part and failed again within 6 months.
2001 Mercury Grand Marquis96,000Visitor
Replaced the EGR 3x (was not aware of the issue) then replaced the snsor with the 3rd EGR. It worked fine for quite some time then the same error occured (P401 - I think?). Cleaning the PCV valve FINALLY did the trick.
2001 Mercury Grand Marquis109,000Visitor
My car is not idle hoe it suppose to and it's smoking from tail pipe
2001 Mercury Grand Marquis150,000Visitor
Had the same reading and too much vacuum on fuel sensor. We had to take the gas tank down and a lines above it was broken. $325 at the dealer for the part. Less than $40 for 2 at the junk yard. Problem solved.
2001 Mercury Grand Marquis98,000Visitor
Check engine light came on took vehicle to repair shop found the erg valve was faulty.
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