2003 Mercury Grand Marquis Mercury Grand Marquis 2003

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2003 Mercury Grand Marquis repairs by problem area

Engine (37%)

Transmission and Drivetrain (10%)

Brakes and Traction Control (4%)

Suspension and Steering (18%)

Electrical and Air Conditioning (27%)

Paint, Rust, Leaks, Rattles, and Trim (0%)

Other (4%)

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Chart based on 49 repairs.
See TSBs and recalls for the 2003 Mercury Grand Marquis.

2003 Mercury Grand Marquis engine repair cost distribution

$2500+ (0%)

$1000 - $2499 (22%)

$500 - $999 (28%)

$100 - $499 (39%)

< $100 (11%)

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Chart based on 18 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.

2003 Mercury Grand Marquis 4dr Sedan

224-horsepower 4.6L V8 4-speed automatic RWD

196000 mi

US $15
a couple of isolated incidents indicating the thermostat stuck closed. Replaced thermostat. 
116000 mi

US $415
Serpentine belt idler was chattering. Dealer first thought it was the idler worn out and that the belt was damaged. Turned out to be the engine cooling fan bearing that had worn out. 
96000 mi

US $1275
replace intake manifold 
113012 mi

US $1069
fuel pump replaced intake manifold replaced 
150000 mi

US $300
Radiator replaced 
157000 mi

US $1000
exhaust bracket was rusted- replaced 
58000 mi

US $700
2 bad coils were causing misfires. All spark plugs were also replaced. 
88000 mi

US $195
Engine missing, replaced plugs and an ignition coil. 
107000 mi

US $100
Replace coil on two cylinders. 
108000 mi

US $550
Replace inner manifold. 
110000 mi

US $200
Replace defective coil pack on one cylinder 
111800 mi

US $400
Replace ram air sensor 
115000 mi

US $500
Intake manifold, coil pack 
66000 mi

US $700
engine cooling fan stopped working, PCM had to be replaced 500.00 parts + Labor = 700.00 
112800 mi

US $600
cracked intake manifold 
27264 mi Camshaft position sensor replaced under warranty. 
81000 mi

US $124
Check Engine light came on. Engine running fine. Water temperature showed cooler than normal. Thermostat replaced. While under repair, coolant flush and coolant replaced. 

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See TrueDelta's information for all Mercury models.

2003 Mercury Grand Marquis Engine Problems

See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs. To see how frequently 2003 Mercury Grand Marquis problems occur, check out our car reliability stats.