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2000 Mercury Grand Marquis Problems

Find the most common issues based on 2000 Mercury Grand Marquis owner complaints.
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Most Common 2000 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 2000 Mercury Grand Marquis Brakes Problems

3 Known 2000 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.
Transmission wear is common. Pieces of broken components are often discovered in the transmission oil pan when the transmission is serviced.

4 Known 2000 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 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.

9 Known 2000 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 2000 Mercury Grand Marquis Exhaust & Emissions Problem

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

0 Known 2000 Mercury Grand Marquis Heating & Air Conditioning Problems

0 Known 2000 Mercury Grand Marquis Maintenance Problems

0 Known 2000 Mercury Grand Marquis Miscellaneous Problems

1 Known 2000 Mercury Grand Marquis Suspension & Steering Problem

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.

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Known 2000 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 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.
The heater hose outlet may leak coolant at the back of the intake manifold. Sometimes this is misdiagnosed as a leaking intake manifold gasket because it resembles a leaking manifold.
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...
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.
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.
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...
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