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:
What are some symptoms of ignition coil failure? Your car engine has a coil, which is basically a high-voltage transformer composed of two wire coils. One of the coils is referred to as the primary coil, and the secondary coil wraps around it. There are hundreds of times more turns of wire on the secondary coil than on the primary coil. The battery's current runs through the primary coil.