1999 Ford E-Series Van p0420

1999 FORD E-SERIES VAN
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ANDREWM
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Computer problem
1999 Ford E-Series Van V8 Two Wheel Drive Automatic

I received this code P0420 when diagnosing my ford e150 van and it came out as catalyst system efficiency below threshold.what is that ?how do i fix it ?
Oct 21, 2010 at 12:50 PM
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BLUELIGHTNIN6
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That is indicating a fault with part of the vehicle's emission system. Most likely the oxygen sensor is ready to be replaced.
Oct 21, 2010 at 6:22 PM