Mechanics

CHEVY ENGINE DIAGNOSTIC CODES

1998 Chevrolet Silverado

Engine Performance problem
1998 Chevy Silverado V8 Two Wheel Drive Automatic 177000 miles

I HAVE 2 CODES FOR MY TRUCK. THEY ARE:
P0420 AND P0430

Catalyst System Efficiency Below Threshold (Bank 1)
Catalyst System Efficiency Below Threshold (Bank2)

Can you tell me what needs to be done to correct these codes? I had a new Catalytic Converter installed 1 year ago. Thanks for your help.
Avatar
TomHayes
March 8, 2008.




Those codes are for bad cat's.

Firrst thign to check is to see if the sensors are good, if they are bad replace them. Also you may have a exhaust leak causing those codes to appear.

Blackop555
Mar 9, 2008.


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