Mercury Grand Marquis Problem Report

Mercury Grand Marquis EVP Sensor Failure May Cause Drivability/Fuel Economy Issues

(16 reports)

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.

Had it in the shop several time for the same EGR valve and light on -
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. -
Check engine light came on took vehicle to repair shop found the erg valve was faulty. -
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