Hello friend, I had a 98 Cherokee which also uses that sensor, which by the way is popularly known as "The little plane", I tell you that in 12 years, this car never had problems with this sensor, the truth is that it's all a matter of luck, the truth is that this type of car is a fighter, its 242 engine is wonderful, well friend, the important thing is that you were able to solve the fault, because there are times when faults confuse us and make us spend money on spare parts that are not, at least your brother-in-law found the fault, greetings.
RE: A big headache due to crankshaft sensor failure