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:
Such problems are often caused by worn-out spark-plug wires that lose some of their insulation, due to the high voltage being passed through them from the coils. When you take your car in for a tune-up, you normally replace the cap and rotor. The rotor connects to the coil and it spins inside the cap.