CATALYTIC CONVERTER ON 99 GMC DENALI

  • Tiny
  • CJ Swenson
  • 1999 GMC

I just had a cng converstion kit installed on my 99 Denali and now my check engine soon light came on. I took it back to the shop that installed the cng kit and they now say that the catalytic converter needs replaced. This is very concerning to me as I had just had the entire vehicle inspected and saftey and I/M done and it passed with flying colors. Could the cng kit cause the catalytic converter to fail?

Tuesday, August 16th, 2011 AT 5:11 PM

1 Answer

  • Tiny
  • Wrenchtech
  • Expert
  • 19,581 posts

The only thing passing that inspection proved is that the code hadn't set yet. You might try clearing the code to see if it sets again. If it does, then you'll have to change the cat.

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Tuesday, August 16th, 2011 AT 6:52 PM

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