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1998 Chevy Silverado ENGINE DIAGNOSTIC CODES

Tiny
TOMHAYES
  • MEMBER
  • 1998 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 177,000 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.
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Saturday, March 8th, 2008 AT 7:54 PM

1 Reply

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
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.
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Sunday, March 9th, 2008 AT 10:10 AM

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