    It is dependent on the type of engine you have. For the 6 cylinder, there are two banks of cylinders. Cylinders 1-3 are on the rear of the engine, while cylinders 4-6 are at the front. Replacing a coil on cylinder 4-6 is simple-simply remove the plastic engine cover, which is held on with 3 small nuts.
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The Bad Pedometer battery is not replaceable so you'll eventually need to buy a new Sport Kit; available only for iPod Nano. The Bottom Line Maybe it's not the reason to buy a Nano, but the useful Nike + iPod Sport Kit and the data-centered Nike+ Web site will appeal to runners who already own a Nano.