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Ford Taurus Diagnostic Trouble Code

Q. Hi Vince, Below are the details of my car:

  • 1996 Ford Taurus GL Sedan
  • 3.0 liter V-6
  • Manual transmission
  • 125,000 miles
  • Carburetor
  • P/S, A/C
Ford Taurus Diagnostic Trouble Code

I have a question regarding the "Service engine soon" light which came on and stayed on yesterday. After checking the code, I found out that it was "Catalyst System efficiency below threshold". What is the most common fix for this and is this likely to cost a lot?

From my readings, I understand that it’s either a problem with the oxygen sensor or the catalytic converter, or maybe even just a case of bad fuel. Any input you can provide would be greatly appreciated.


A. Without the specific code, all I can do is offer general advice.

Basically that code description is saying that your Three Way Catalytic Converter (TWC) is not working as well as it should. Generally if this code appears alone, it is a good bet the TWC is bad. If it appears with other codes it may indicate engine problems leading to the bad TWC.

Additional Information provided courtesy of ALLDATA

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