1998 Mercury Marquis diagnostic code P0430

Tiny
ERIC M
  • MEMBER
  • 1998 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 239,000 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
Tuesday, February 17th, 2009 AT 6:47 PM

1 Reply

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 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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