» »

Problems for specific Mercury Grand Marquis years:

Car problem reports

Report A Problem

Problem with your car? See what our experts say or submit your own.

Newest reported Mercury Grand Marquis problems

 

Verified for the Mercury Grand Marquis

Bad spark plugs or an ignition coil can cause ignition misfire, which will illuminate the Check Engine Light.

3 Reports
Me Too

Reported by bearmug and 87 others for the Mercury Grand Marquis

The car had 64600 miles on it and the headlights started going out while driving, which can be very dangerous. The problem is in the Light Control Module which is an expensive part (around $500 to $600 + labor).

88 Reports
Me Too

Verified for the Mercury Grand Marquis

One or more oxygen sensors may fail resulting in illumination of the Check Engine Light.

1 Report
Me Too

Verified for the Mercury Grand Marquis

A spring in the seat belt buckle may wear or fail, causing the airbag light on the instrument panel to illuminate. Failed buckles will require replacement.

36 Reports
Me Too

Verified for the Mercury Grand Marquis

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.

13 Reports
Me Too

Verified for the Mercury Grand Marquis

It is not uncommon for the intake manifold and/or valve cover gaskets to develop a coolant or oil leak. Leakage from the intake manifold may result in coolant in the engine oil. Coolant mixing with the engine oil severally impacts the lubrication ability of the oil. Internal engine may result if this condition is not repaired promptly.

2 Reports
Me Too

Verified for the Mercury Grand Marquis

Transmission problems are common in this model, often as a result of a failed front pump. The pump loses its ability to create hydraulic pressure, which an automatic transmission needs to function. A sign of front pump failure can be a whine type noise.

9 Reports
Me Too

Verified for the Mercury Grand Marquis

The steering gear may have an internal problem that makes turning to one side difficult; it may need to be replaced. A wheel alignment is needed after the steering gear is replaced.

2 Reports
Me Too

Verified for the Mercury Grand Marquis

The engine may overheat at idle when the AC is on. A new, upgraded fan motor and resistor may be required to correct this concern.

9 Reports
Me Too

Verified for the Mercury Grand Marquis

The composite (plastic) intake manifold may crack near the thermostat housing and cause a coolant leak. Ford released an updated manifold that was reinforced to prevent a recurrence. No recall was issued for this problem but Ford did extend the warranty to seven years on some models from the date of purchase.

83 Reports
Me Too

Verified for the Mercury Grand Marquis

The throttle position sensor (TPS) may fail. Common symptoms of a defective TPS can be rough idle, hard starting, hesitation on acceleration, poor fuel economy, and stalling.

28 Reports
Me Too

Verified for the Mercury Grand Marquis

The alternator may get too hot, causing premature bearing failure.

1 Report
Me Too

Verified for the Mercury Grand Marquis

If you experience difficulty starting the engine when cold, stalling at idle, or hesitations during acceleration, it may be the idle air bypass valve. This valve helps the vehicle idle steady when the accelerator pedal is not pressed.

7 Reports
Me Too

Verified for the Mercury Grand Marquis

An oil leak may develop from the the right side head gasket.  Oil from this type of leak will commonly drip onto the starter. Our technician tell us an updated head gasket is available to correct this concern.

10 Reports
Me Too

Verified for the Mercury Grand Marquis

The battery light may illuminate on the instrument panel because the alternator wire harness connector is damaged. A new connector kit is available and should be installed to correct this concern.

3 Reports
Me Too
Ask a Question
More about this car