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I have a 1998 Mercury Mountaineer 5.0L with the engine code P0430, how do I fix it?

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I have a 1998 Mercury Mountaineer 5.0L with the engine code P0430, how do I fix it?

Vehicle: 1998 Mercury Mountaineer 5.0L

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You could try clearing the code and run high octane gas for a few days.

P0430 MERCURY - Catalyst System Efficiency Below Threshold Bank 2
Read more: https://www.autocodes.com/p0430_mercury.html

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