1998 CHEVY SILVERADO ENGINE DIAGNOSTIC CODES

  • Tiny
  • TomHayes
  • 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.

Saturday, March 8th, 2008 AT 7:54 PM

1 Answer

  • Tiny
  • blackop555
  • Expert
  • 10,563 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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