Your BMW car or SAV depends on the spark plugs to help produce the flash of electricity that ignites the air-and-fuel mixture in your engine's combustion chamber. How the process works is straightforward.

When you either turn the ignition key or press the "Start" button in your vehicle, an ignition switch activates. That, in turn, causes the starter motor, starter solenoid, ignition coil, and battery to work together and generate an electric charge. That charge is captured by the spark plugs' leads and then used to initiate combustion.

How to Recognize Faulty Spark Plugs

Unfortunately, even the best spark plugs can eventually go bad. The gap between the leads can widen too far to produce effective sparking. The plugs can get corroded. When that happens, you'll notice signs like these:

Engine misfires

Uneven engine idling

Difficulty starting your vehicle

Your "Check Engine" dash light comes on

Save up to 35% When You Buy Genuine BMW Spark Plugs Online

One sure way to prevent problems? Check your owner's manual for your recommended maintenance schedule. Another smart move is to replace your failing spark plugs with new ones from your manufacturer. They are, after all, the only ones designed specifically for your model and its engine. Find them right here in our online auto parts catalog, in stock and priced well below the MSRP. Buy today and we'll get your order shipped right out!