The definition of a rule is  an official regulation, code of regulations or set practice. An example of a rule is that a red light means stop. An example of a rule is an employer demanding their employees arrive at 8am.
The average cost for a fuel injector replacement is between $231 to $342. Labor costs are estimated between $168 to $213 while parts are priced between $63 to $129. Get a personalized estimate based on your location and specific car.
It depends. If you have a twin turbo BMW (135i, 335i, 535i) with the N54 engine, the most common problem is the High Pressure Fuel Pump (HPFP) which has an extended warranty that covers the pump to 100K miles, and by then they will have hopefully solved whatever design flaw is causing them to fail like crazy.