I have a 2011 Prius and have never changed spark plugs or coils in 11 years. The dealer asked about $2,000 to replace the coils and spark plugs. It took about an hour and the parts cost less than $100. I also did a number of things the dealer wouldn't do. I've only driven about 200 miles with these coils since I bought them. I'm a little intimidated by the number of reviews saying it didn't work after a few months. I drive long distances and I hope it doesn't let me down.
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