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1999 GMC Sierra Diag Code P0420

Tiny
SKELIX912
  • MEMBER
  • 1999 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 133,000 MILES
I used my programmer to get code P0420 and so I took it to a midas to have them take a look. The guy told me that I needed to replace my cat. Converters and that it would cost $1,200 parts and labor. The guy also said that I should replace all 4 o2 sensors. I just moved to az from ca but will eventually end up back in ca so I want to stay ca emissions legal. Is that price typical for a cat. Converter? Are there any other options around replacing the cat. Converter?
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Wednesday, July 16th, 2008 AT 2:10 PM

1 Reply

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Usually the catalyst efficency codes are pretty accurate. Try clearing the code and driving to see if it comes back. I have seen that code set if the truck is driven really hard, but not come back if driven easy.
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Wednesday, July 16th, 2008 AT 3:06 PM

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