First, the replacement cost entails the purchase price of the new ignition switch or spare part. Then, you have to count the installation cost if you will prefer to use a mechanic. If so, you might pay a labor cost of sixty to one hundred and eighty dollars. If you add that to the price of a new ignition switch or spare part, you could pay one hundred and thirty to four hundred and eighty dollars. If your car is still on warranty, you might pay much less.