If you have a B6 platform Audi A4 like I do, you’ve probably experienced the failure of an ignition coil while driving. You know the feeling—you suddenly lose power, the car shakes when you accelerate, and the check engine light flashes. This has happened to me three times in the past five months, including one on the Golden Gate Bridge in December. It happened to me again last Friday on my way to work. And, although it’s no fun and potentially dangerous to be driving when a coil fails, replacing it is a snap. All you need to do is remove the engine cover to access the coils. The only frustrating part is that, unless you have a VAG-COM or some other way to read the CEL code, you’ll need to find the bad coil by replacing one at a time and starting the car until the CEL disappears. Nonetheless, the whole thing can be done in about five minutes, and you’ll save time and about $150 in so-called “labor” costs at the dealer. Honestly, I’m not sure how such a quick procedure can cost so much, but the dealers will get away with what they can. Changing an ignition coil on this car is far easier than changing a headlight or windshield wiper blades. You can buy the coils here for about $30 each.