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2004 Mitsubishi Lancer Ralliart 2.0L with engine code P0421, what needs to be fixed?

Vehicle: 2004 Mitsubishi Lancer Ralliart 2.0L

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You must replace the catalytic converter. There is a factory service recall for this problem. You should contact your Mitsubishi dealer.

P0421 MITSUBISHI - Warm Up Catalyst Efficiency Below Threshold- Cylinders 1-4
Read more: https://www.autocodes.com/p0421_mitsubishi.html

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