1999 Chevy Tahoe Emissions diagnostic codes and repair

1999 CHEVROLET TAHOE
244,000 MILES • V8 • 4WD • AUTOMATIC
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CHANCES
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Hi,
I have a 1999 Chevy Tahoe.
I just failed my emissions test and had the following codes given to me by the mechanic:

P0420, P0430, P0442

He suggested that the repair may be simple and suggested that I ask on a forum. Can you tell me if there is an easy fix for this, or what kind of fix is required?
Jul 27, 2008 at 12:11 PM
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MERLIN2021
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No easy fix...420 and 430 are catalyst efficiency codes, the converters are worn out. 442 is small leak evap system for emissions. It may need testing on a smoke machine. Dealer has the equiptment for these tests.
Jul 27, 2008 at 12:17 PM