hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
70,100 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2003 Mercury Mountaineer fuel system problems

fuel system problem

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2003 Mercury Mountaineer Owner Comments

problem #3

May 022016


  • miles


2003 Mercury Mountaineer recalls I have had to change the intake manifold, ignition coils, I'm having a gas smells now, transmission thumps hard when going into first gear, sounds like my rear end is about to fall out, my front seat is electric and doesn't move, the O/D light comes on, check engine light on, brake light on, I keep trying to fix everything the more I fix the more problems that come up, I have check the recall list for 2003 Mercury Mountaineer recall on transmission and also called the Ford co they said there is nothing. The problem is getting worst and afraid I will be on the highway with my grandchildren when it breaks. I've had transmission level checked said it was fine. Getting ready to do a complete tune-up on it to see if that will help with the smell of gas and make it run better. It idles high. It's worst when I'm on the highway.

- Lake Charles, LA, USA

problem #2

Jul 162015


  • 113,000 miles
The contact owns a 2003 Mercury Mountaineer. While driving at various speeds, the vehicle suddenly shut off. The vehicle was taken to an independent mechanic who diagnosed that the fuel pump was faulty. The fuel pump was replaced, but the failure continued. No further information was available. The manufacturer was not notified of the failure. The failure mileage was 113,000.

- Denver, CO, USA

problem #1

Sep 142014

Mountaineer 8-cyl

  • 97,300 miles
On the baltimore-Washington parkway (295 N ) northbound, changed lanes to the left and accelerated. The gas peddle was pushed to the floor, stayed there and would not release. I stood on the brakes, but only somewhat slowied the acceleration. The vehicle continued until we reached about 80mph and coming close to rear ending the vehicle in front of me. I went off on the shoulder and turned off the ignition key to get the vehicle stopped. The brake overheated brakes. I could not see a problem. This was not caused by a floor mat. The pedal was stuck to the floor. I wiggled and pulled and it come back up with a pop. In daylight the next day, I inspected the pedal and pushed it down. It again went to the floor and stayed there. I slid under the dash and found that the horizontal pin that holds the pedal to the floor bracket had backed out sideways from right to left, allowing the pedal to go somewhat sideways and the motor for the adjustable pedal assembly had caught on a metal bracket keeping the pedal from returning to the up position. I removed the pedal assembly and inspected the problem. This is poor engineering and there should be a recall.. there are no clips or pins to hold the pedal pin in place ! ! ! the assembly relies on slight interference between splines on the pin and splines inside where it goes through the pedal. What happened was, that over a period of time, from the pedal wiggling, the pin backed out.from use, on its own. Again, this not sufficient to keep the pedal assembled. It need clips on both ends or cotter pins on both ends of the pin assembly. A concern is the use of plastic bracket to mount the pedal to the floor. In my past experience, the mounting brackets had been made of metal. Plastic fatigues faster than metal and is prone to cracking and breaking.

- Westminster, MD, USA

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