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
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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