code reader is reading 0420 catalyst system eficiency below threshold (bank 1) what is the fix for this. thanks very much
Jun 22, 2010 at 7:01 AM
1998 Chevy Suburban code reading
1998 CHEVROLET SUBURBAN
KEVINSHAWN
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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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