No
No, but your crankcase should be vented anyway. If your getting coolant in the crankcase it is getting in from a bad head gasket or cracked head or bad intake manifold gaskets. If you don't fix it soon your engine will be toast.
If it is part of the valve stem, yes.
It is definitely possible that being rear ended can cause the mass airflow sensor to go bad. If the exhaust system has been damaged, it will effect the airflow. Also the impact itself may have jarred the sensor loose.
Engine sensors will only "go bad" from environmental effects. Lack of oil causes excessive heat. Heat can cause cam sensor failure
A bad crankshaft sensor would stop the engine and not restart.
Yes, a bad ignition coil / misfire will cause an unburned mixture of gas/air to go into cat converter which will than combust in it and cause damage to either catalitic converter, oxygen sensor(s) or both. J.Dropic
The crank position sensor, sometimes referred to as the crankshaft position sensor, is a small plug found on motor vehicles that monitors the speed at which the crankshaft is rotating. This information is relayed through the vehicle's computer, which then uses it to calculate ignition timing. Crankshaft sensors may go bad because of faulty construction or high mileage on the vehicle.
A bad injector or an o2 sensor that is bad causing too much fuel to go to the combustion chamber.
First....use an OEM sensor...1996 Jeep Grand Cherokees have been known to not work properly on non- OEM Crankshaft sensors. Excessive heat can cause it to go bad. Proper installation is critical. Also there is a joint in the wiring from the sensor to the PCM. It can corrode and sometimes cause stalling of the engine whether the engine is cold or hot. PCM could be going bad.
It is important to know the causes of problems in a vehicle. A surging idle can be cause by a bad o2 sensor, bad fuel pump, or a computer starting to go bad.
EVO sensor. Also known as steering speed sensor. Bad power steering pump, hose broke.