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2005 Mercury Grand Marquis Problems

Find the most common issues based on 2005 Mercury Grand Marquis owner complaints.
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Most Common 2005 Mercury Grand Marquis Problems

The 1996-2001 Mercury Grand Marquis with a 100% plastic intake manifold is known for engine overheating, even with normal use, and a coolant leak from the front of the manifold. This will often tr...
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 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.
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0 Known 2005 Mercury Grand Marquis Brakes Problems

2 Known 2005 Mercury Grand Marquis Drive Train Problems

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....
Wear on the rear axle shafts near the bearings can create excessive play and lead to gear oil leaking past the seals. Gear oil will leak onto the brake backing plate, brakes, and wheels.

4 Known 2005 Mercury Grand Marquis Electrical & Lights Problems

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.
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.

6 Known 2005 Mercury Grand Marquis Engine Problems

The 1996-2001 Mercury Grand Marquis with a 100% plastic intake manifold is known for engine overheating, even with normal use, and a coolant leak from the front of the manifold. This will often tr...
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.
Bad spark plugs or an ignition coil can cause ignition misfire, which will illuminate the Check Engine Light.

1 Known 2005 Mercury Grand Marquis Exhaust & Emissions Problem

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

0 Known 2005 Mercury Grand Marquis Heating & Air Conditioning Problems

0 Known 2005 Mercury Grand Marquis Maintenance Problems

0 Known 2005 Mercury Grand Marquis Miscellaneous Problems

0 Known 2005 Mercury Grand Marquis Suspension & Steering Problems

13
Known 2005 Mercury Grand Marquis Problems & Complaints

The 1996-2001 Mercury Grand Marquis with a 100% plastic intake manifold is known for engine overheating, even with normal use, and a coolant leak from the front of the manifold. This will often tr...
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 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.
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.
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.
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 ...
Bad spark plugs or an ignition coil can cause ignition misfire, which will illuminate the Check Engine Light.
The Mercury Grand Marquis 4.6L V8 engine is known for displaying the normal symptoms of a coolant leak, including overheating, especially when the vehicle is idling, the strong smell of coolant fro...
One or more oxygen sensors may fail resulting in illumination of the Check Engine Light.
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...
Wear on the rear axle shafts near the bearings can create excessive play and lead to gear oil leaking past the seals. Gear oil will leak onto the brake backing plate, brakes, and wheels.
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