Q: Leaf broke while driving

This is a common issue. There are several components that can fail to prevent the shifting out of park. The interlock system has two things that often fail, the switch itself and the electronic interlocking mechanism itself. If the switch...

This issue seems to me like it would be caused by the brake switch (https://www.yourmechanic.com/parts/brake-light-switch). When the brake switch is engaged, the brake lights come on. There is also a shift interlock solenoid (https://www.yourmechanic.com/parts/shift-interlock-solenoid) in most vehicles that is not...

Thanks for writing in about the transmission problem with your 1999 Mercedes-Benz S320. Typically the issue you're speaking about is a result of overheating inside of the automatic transmission. The overheating can be caused by dirty transmission fluid (https://www.yourmechanic.com/question/need-to-have-transmission-fluid-flushed-after-i-used-the-wrong-kind), or...

Hello. It sounds like the oil is thinning out due to the heat of the engine when the car is operating at high speeds. This will result in the low oil sensor giving a false reading. There could also be...

You either have a leaking injector (https://www.yourmechanic.com/services/fuel-injector-replacement) that is dripping fuel after you shut off the engine and causing a flooded engine and will cause the hard start and erratic running conditions. You could also have a fuel pressure regulator...

Being that your car is running better with the MAF disconnected, I say replace your MAF (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement). Most cars would shut off without the MAF connected. If you need a technician to scope out the problem in person, a certified...

Hello - You likely have a shorted coil (https://www.yourmechanic.com/services/ignition-coil-replacement) or ignition module. One of the ignition components is pulling too much current blowing the fuse (https://www.yourmechanic.com/services/fuse-replacement). Check the coils and ignition module for shorts or other conditions drawing too much...

The effect on engine wear, efficiency of operation, and service life (i.e., engine service life) due to a switch to a blended synthetic oil from a full synthetic oil is probably not even "measurable". Full synthetics will be less subject...

Any vehicle purchase can be a crap shoot. Vehicles that have a reputation for being unreliable or expensive to maintain can sometimes be as reliable as sunshine while a vehicle with a reputation for reliability can be your worst nightmare....