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A P0420 code for a 1999 Mercury indicates that the vehicle's onboard diagnostic system has detected a problem with the catalytic converter's efficiency. Specifically, it suggests that the converter is not performing as expected in reducing emissions. This could be due to a faulty catalytic converter, damaged exhaust components, or issues with the oxygen sensors. Diagnosing the exact cause typically involves inspecting these components to ensure they are functioning correctly.

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3w ago

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