Mercury Mountaineer check engine light comes on

Filed Sep 3, 2025 · Engine, Fuel system · 200,000 miles · AZ

The contact owns a 2008 Mercury Mountaineer. The contact stated that the check engine warning light was illuminated. The contact stated the vehicle stalled while driving at an undisclosed speed. The contact stated that several attempts were needed to restart the vehicle to continue driving. The contact stated that the gear shifter intermittently failed to move to the intended position. The contact stated that there was an abnormal fuel odor inside the cabin of the vehicle, and the fuel level was lowered sooner than normal. The vehicle was taken to the dealer to be diagnosed; however, the result was not provided. The contact stated that there was a code for an EVAP failure. The vehicle was not repaired. The vehicle was taken to another dealer, Peoria Ford (9130 W Bell Rd, Peoria, AZ 85382) however, the contact was not provided the cause for the failure. The vehicle was taken to an independent mechanic; however, the vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 200,000.

Filed Aug 18, 2022 · MI

I was driving on the expressway and my truck just shut off. The car panel Illuminati to a check engine light and a wrench. I had to put on my caution light and make it to the shoulder. That was scary. I sat for 10 minutes before it started back up. I've taken it to the dealership and all they did was guess what the problem could be. They said it might be the fuel pump or something electric or the computer. That's not doing me any good, because I'm still having this problem.

Filed Jun 7, 2022 · Electrical · 109,000 miles · NY

The contact owns a 2010 Mercury Mountaineer. The contact stated that the check engine warning light was illuminated. The vehicle was taken to an independent mechanic to be diagnosed. The contact was informed that the computer had provided an incorrect error code. The vehicle was also diagnosed by an authorized Ford tech who confirmed the failure with the computer. The manufacturer was contacted and informed of the failure. The manufacturer referred the contact to the federal safety agency to file a complaint. The vehicle was not repaired. The approximate failure mileage was 109,000.

Filed Dec 21, 2016 · Engine · 90,000 miles · TX

On two occasions the engine cut out while driving the car, all the engine warning lights came on. Once the car was safely off the road and placed in park it would start and continue to operate. The ford dealer said that there was not fault code in the computer, they could not duplicate the failure and could not find any fault in the engine system. Ford service representatives said I should go a different ford dealer and see if they could solve the problem. I find similar engine failures documented on the internet for this generation of car. More current similar model are not reported to have this problem. Thus I assume ford found and fixed this problem. I asked them to tell me how they solved the problem, they said that was not possible. So, I have an otherwise good car which I can do use nor in good conscience sell to someone else. Please help!

Filed Sep 16, 2016 · Fuel system, Suspension · LA

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.

Filed Mar 5, 2016 · 134,483 miles · PA

2006 mercury mountaineer driving along around town or highway and will just loose power without warning after the fact then the engine light comes on along with a red wrench or an orange wrench, first place I had it to said it was a negative battery cable that was loose so they tightened the cable, took it home stalled out on me, took it to another dealer said was reading that it was the fuel pump driver module drove very next day stalled on me once again taking it to the ford dealer itself said could be a number of things one is that the mass air flow has exposed wire which they will be fixing that and cleaning out the electrical throttle body and see how that is if not then they will try replacing the torque convertor clutch circuit for one this needs to stop being a guessing game I'm not a millionaire I used my 401k to purchase this vehicle, its such a huge safety issue while on the main highway and just up and stopped on me luckily I was able to drift over to the side of the road in the meanwhile with a tractor trailer coming up behind me with several other traffic huge safety concern ford contacted by the one garage and they "wasn't sure" what it could be, well it stops anytime while driving anywhere such a huge safety hazard someone has to know something without having to just "guess" the situation. Also every time it rains the water seeps thru the sunroof and the overhead light you can see it came thru the liner itself when it dries up, so heartbreaking because I fell in love with this vehicle that I have only had for about a year and half.

Filed May 8, 2015 · Airbags, Electrical · 167,000 miles · MN

While driving to work one morning all I here was ding ding ding od/off started flashing . Sec later check transmission light came on now when I drive putting foot on the paddle to go it will idle up I release and it will shift n go. Aamco saying that I need a rebuilt tranny that's bs with all what I have been reading it's just a rip off I don't have $3500 to get this fix. Now seeing not once not twice so many complaints I read that people paid for 2 or more tranny for the vehicle's and nothing is been done about it. And the ford deals knows about it..... Do a human being has to lose their life before ford dealer's can own up to there responsibility? If they was in our shoes they would want the same thing vice verse they say u reap what you sow. Please please please help up just fix our transmission that's all.. Another thing ABS light stays on check engine light stays on the seat belt light stays on all my windows doesn't let down now wtf?

Filed Feb 17, 2015 · Engine · 24,000 miles · TX

**************************engine will shutoff without warning********************** it has happened with various levels of gas, various weather conditions, and both while stopped and moving. The "check fuel filler inlet" light will come on. Sometimes, the check engine light will remain on, but will clear within the next startup or two. Car has been at dealers at least 4 times for issue. Engine throttle body and crankshaft sensors have been replaced. In the beginning, the vehicle would do this once or twice, then run perfectly for months at a time. Each time it is "fixed" by dealer, who claims they cannot replicate the problem. Lately it will stall 4-6 times within a 30 minute period. Last month, I was able to read code 2107. Today, it stalled again 6 times, no check engine light remains, no code to be read. When car is running normally, it sometimes hiccups and seems to run rough.

Filed Oct 28, 2014 · Transmission · 48,012 miles · NY

While driving at around 35 MPH the o/d light started flashing, error message check transmission and check engine light stayed on. The vehicle started shifting erratically from a start then had problems shifting into gears. I brought it to my mechanic and decided to change, clean and flush transmission fluids. This did not solve the problem. I then went on line to find cures for this problem at ford motor co web site and there was no information there . I searched the web for similar problems and came up with over 500 complaints with ford blazers' and mountaineers 2002 through 2004 transmission related problems with the same symptoms..5r555 solenoid pack. I found a company that claimed the problem is the transmission 5 solenoid pack needing a up grade and this should solve the problem through USA industries in bay shore ny. Purchased this oem ford upgrade packet, installed this miracle part and the problems were still there. Now USA industries doesn't want to hear about refunding my monies even though I am still in the refund time limit.. Hopefully ebay will resolve there poor customer relations issue. Ford claims I need to have a complete transmission replacement at approximately $2500.00. I spoke to several ford certified mechanics and they told me that ford is aware of this issue but are hesitant to issue a recall since there have been no deaths.. Can that be for real????? Is anyone else ready to stand up to ford for a recall demand on our cars??

Filed Oct 17, 2014 · Engine · 240,000 miles · OH · fire

Tl* the contact owned a 2000 mercury mountaineer. While driving approximately 65 MPH, fuel fumes emitted into the vehicle and the engine began to smoke before it caught fire. The check engine indicator illuminated. The fire department was able to extinguish the fire. The vehicle was towed to the contact's residence. The vehicle was deemed destroyed. The manufacturer was not notified of the failure. The approximate failure mileage was 240,000.