1998 MERCURY MARQUIS DIAGNOSTIC CODE P0430

  • Tiny
  • Eric M
  • 1998 Mercury Marquis

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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Tuesday, February 17th, 2009 AT 6:47 PM

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  • Tiny
  • bluelightnin6
  • Expert
  • 17,062 posts

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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Tuesday, February 17th, 2009 AT 7:26 PM

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