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I believe you mean a code that said 420. that is for the car effiency.
this code comes up when the cat converter is worn out and cannot do its job anymore cleaning the exhaust gases. it must be replaced.
as far as money, you can get one at a parts store. they offer different brands at different prices. they range from 150 to around 400 depending on warranty and brand. the cheaper ones do not last long as they will not have much precious metals inside.
the labor is 1.5 hours. a good estimate would be around 350-450 for the repair.
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