Understanding the appropriate procedure and diagnosis codes for a particular study question is an important part of analyzing Medicare data. These codes are very specific and can change from year to year as new codes are added and others are discontinued.
There is no wear-out factor in the coil itself other than thermal cycling and the damage it may cause. Boots and wires do age, resulting in reduced insulation value over time. The key to correct ignition system diagnosis is to understand the details of how the system you are working on really functions. PAGE:
The excessive vibrations can cause engine mounting eventually to fail. Extreme cases of oil fouling can cause hard starting, engine stalling and ignition coil failure. The ignition coil is connected to spark plugs by high-tension wires and sends surges of electricity to fire the plugs. Oil-fouled plugs send the surges back to the ignition coil instead of its normal path.