2003 Mercury Grand Marquis Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2003 Mercury Grand Marquis
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2003 Mercury Grand Marquis ProblemsThrottle Position Sensors May Fail and Cause Engine Performance Problems
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 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.
2003 Mercury Grand Marquis QuestionsMy car wont go in drive only reverse (1 answer)
I put my car in drive it goes in reverse
2003 Mercury Grand Marquis RecallsHeadlights Fail To Operate
The lighting control module may fail, resulting in the loss of headlight operation. Dealers will replace the lighting control module free of charge to resolve the concern.