Title: P0420 error code 7 months later.
Product review: Received the product in good condition with everything needed for install on my Honda Civic. Had it installed professionally at the Honda dealer. They said it installed with no problems, but warned me that often aftermarket catalytic converters will throw error codes due to not having enough platinum in them. Sure enough, about 7 months after the install I got a P0420 "catalytic converter efficiency below threshold" error code. Called Dorman, and they said they will honor the warranty through the seller. Basically I would need to return this part to amazon.com, and they will send me a new one. Given the high-ish labor costs, and since I have no confidence a new one will be better, most likely I will keep this one. Not happy with the quality.
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