Track days, scheduled maintenance, suspension tuning if you're wrenching on your BMW or MINI, certain hardware is bound to come off more than once. Brake caliper bolts, suspension arms, and subframe fasteners take a beating from heat, road grime, and time. Don't let your next upgrade turn into a nightmare of sheared bolts and stripped threads.
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Ignition coils are key to the efficiency and performance of your BMW. With a faulty coil the spark plug is not burning the air/fuel mixture properly and that can lead to problems anywhere in the engine and exhaust (including catalytic converters and O2 sensors). Problems with one or more coils will cause a fault code, but not always a check engine light. A misfire code may be related to an ignition coil, but could be from other things as well. ometimes, a visual inspection of a coil and coil boot will give an indication of a failure. You can also move coils around to different cylinder banks to see if the misfire code follows a suspect coil. We suggest always having one or two coils on hand to keep as spares.
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