I have a multiple ignition coils - why?

Some later vehicles have done away with the ignition distributor totally, as these ignition control units are so sophisticated and accurate that there is no need for an ignition distributor. The sensors detect the position of the crank and in turn control the the current to each separate ignition coil for each spark plug. The advantage of having a multi coil system, unlike the convention one coil system, is that when one coil would go bad your vehicle, the vehicle would be in-operative, but when say one of six coils is defective, you are still able to drive the vehicle on five coils. The disadvantages are that  it is sometimes difficult to tell which one of the coils is defective without the right diagnostic equipment and thus more expensive to replace multiple coils than replacing just one coil.

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