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:
Most Electronic Ignitions have four parts that can fail. trigger (pickup) coil, a source coil, a CDI unit (Black Box) and an ignition coil. The trigger coil tells the black box when to trigger the spark. It does this when a small magnet on the flywheel passes the trigger. The source coil produces the power.