DIAGNOSTIC CODE P0430

1998 Mercury Marquis

Tiny

Eric M

February, 17, 2009 AT 6:47 PM

Computer problem
1998 Mercury Marquis V8 Two Wheel Drive Automatic 239000 miles

code P0430 keeps engine light on all the time. Have been told by others it is a bad ox sensor and won't do any harm. Is this true? And what can be done

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1 Answer

Tiny

bluelightnin6

February, 17, 2009 AT 7:26 PM

P0430 Catalyst System Efficiency Below Threshold (Bank 2)

Indicates a faulty oxygen sensor on bank 2 of exhaust. Failing to replace it will result in much lower fuel mileage and eventually it will ruin the catalytic converter, a very expensive component. I suggest replacing the sensor as it is very simple and cheap.

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