Q: Check engine light

I would recommend having your sunroof inspected (https://www.yourmechanic.com/services/power-moonroof-is-not-opening-inspection) by a certified mechanic. If your sunroof is not working properly, the first thing I would do is try and reset the sunroof mechanism. This can be done by either unplugging the...

The VANOS unit or solenoid can cause a rattling sound from the engine. The VANOS is a camshaft timing system which runs off of engine oil pressure. If the oil is the wrong viscosity or the system has a buildup...

Hi, thanks for writing in. Believe it or not, this happens quite a bit when people swap OEM air filters to K&N or other products. It has nothing to do with the aftermarket part however. The P-0104 OBD-II error code...

There may be a downloadable diagnostic trouble code(s) (from the PCM) so I recommend that you request a no start diagnostic (https://www.yourmechanic.com/services/car-is-not-starting-inspection) to first see if there is a quick and ready indication of the problem and thence a solution....

Hello, thank you for writing in. The engine may be in a protective shut down mode that wont let it start, or it may be seized. It is hard to tell based on the given information. You will want to...

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...

Hi there. If smoke is coming from the back of the engine, it's possible that you have a small coolant leak, oil leak or even windshield wiper fluid leak. Smoke can also come from an electrical system malfunction, serpentine or...

You should request a starter circuit diagnostic (https://www.yourmechanic.com/services/starter-replacement) to get this resolved. If you want to attempt to diagnose it yourself, first perform a load test (https://www.yourmechanic.com/services/battery-is-dead-inspection) on the battery just to be sure that the battery is not an...

Exhaust leaks are a high priority to fix due to the dangers of carbon monoxide. Also, dependent on leak location, exhaust leaks can throw off the proper operation of otherwise good oxygen sensors. To request identification of where the exhaust...