2003 Lexus GS 300 cat convertors

2003 LEXUS GS 300
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K2SAINT
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Engine Mechanical problem
2003 Lexus GS 300 6 cyl 160000 miles

i replaced 1 and 2 cat convertors and still failed vehicle inspection "system not ready". How many miles must i drive for the system to be ready
Mar 21, 2010 at 4:33 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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