Q: How do I reset the Fuel Used setting?

Hello. It sounds like your time delay in the control module is not working. It may also be a short in the switch (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-headlight-switch) but that is not as likely. The retained power relay may be failing or the control...

Hi there. This can be caused by a number of things. Since the dealership installed a scan tool and didn't see any codes then it must not be a sensor failure. I typically start by checking the back pressure of...

I would recommend checking your alternator (https://www.yourmechanic.com/services/alternator-replacement) as well as all fuses (https://www.yourmechanic.com/services/fuse-replacement). Test the alternator with a multi meter to ensure that it is maintaining 13.8 - 14.2 volts while the vehicle is running. Next, use a circuit tester...

Hi there. The rear wheel being out of alignment, could be the result of a bent strut assembly (https://www.yourmechanic.com/services/strut-assembly-replacement), a bent trailing/control arm (https://www.yourmechanic.com/services/control-arm-assembly-replacement), a bent bearing knuckle and/or bent rear subframe. Replacing components without diagnosis can be expensive and...

Hello - a "skipping a gear condition (https://www.yourmechanic.com/question/car-skips-gears)" like this is most commonly a failure of the 3-4 gear clutch pack (for the 4L60E transmission). It is also possible that one of the valve passages in the transmission is damaged,...

Hi there. There could be an issue with the high beam switch. Check to make sure that the wires are connected correctly to the high beam switch. Also, check the bulb in the high beam on the left side. See...

Hi there. You will have to remove the timing belt (https://www.yourmechanic.com/services/timing-belt-replacement), exhaust manifold, intake manifold, all vacuum lines, the cylinder head, and the oil pan to gain access to the piston removal. Drain out all of the oil from the...

The vacuum diagram is in a .jpeg or .pdf format and cannot be attached to this response. Please note that the complete Factory Service Manual (FSM) for your vehicle, including the vacuum and wiring diagrams, is available on Ebay at...

For this 2004 year Mercury Mountaineer they were only equipped with a 5R55S transmission for the 4.0 and 4.6 liter motors. The only different transmissions would be for rear wheel drive or all wheel drive. They are both 5R55S base...