What Causes BMW Coils To Go Bad?

BMW coils are a type of ignition coil used in many BMW vehicles. There are many reasons why a BMW coil may go bad, such as wear and tear, age, or damage.

What causes ignition coils to keep going bad?

There are many reasons why ignition coils can fail. Often, the coil will become corroded or fouled with debris, which will cause the coil to no longer provide adequate spark to the air/fuel mixture.

In severe cases, the coil wire may even break, which will cause the engine to not start.

How long do BMW ignition coils last?

BMW ignition coils last anywhere from 100,000 to 240,000 miles depending on driving habits and type of engine. The coils are a critical part of the ignition system and should be replaced when they reach the end of their lifespan.

Why do BMW coils fail?

There are a few reasons why BMW coils can fail. The most common reason is because the wire insulation is either worn or damaged, causing a short circuit.

Over time, this can lead to more frequent failures. Other factors that can contribute to coil failure include: improper installation, damage due to corrosion, water exposure, and tampering.

How long should ignition coils last?

It depends on a variety of factors, including the type of fuel used, how the engine is used, and the quality of the spark plugs and coils. Generally, however, ignition coils should last for around 10,000 to 12,000 miles if the engine is operated normally and the spark plugs and coils are in good condition.

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If the engine is run at high RPMs or subjected to high heat, the coils may last for up to 16,000 miles or more.


There are a few different reasons that BMW coils might go bad. One possibility is that the coil itself is defective.

Another possibility is that there is an issue with the spark plugs or the ignition system, which can cause the coil to overheat and fail. Finally, if the engine is running too lean or too rich, it can also cause the coil to fail.