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:
Symptoms of Faulty Ignition Coils. 1  The ignition coil is the source of the spark that ignites the air-fuel mixture in the engine's combustion chamber. The ignition coil receives a voltage of 12V from the car's battery and multiplies it to a higher voltage level. 2  A weak spark is the first sign that the ignition coil may be failing.