Q: Would you be able to give me an estimate range for a code P0421 Low catalyst efficiency bank on a 2002 Mitsubishi Galant?

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I got an estimate for about $3000 to fix a code that came up on my check engine light. It is code P0421 for low catalyst efficiency bank. I was hoping you could give me an honest and true estimate of a range.

My car has 139770 miles.
My car has an automatic transmission.

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