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1999 Chevy S-10 P0171

Tiny
CARTMAN98
  • MEMBER
  • 1999 CHEVROLET S-10
1999 Chevy S-10 4 cyl Two Wheel Drive Manual 140k miles

My truck is running the p0171 code and the bad cat code as well. I knew my cat was going out for a while, but it didn't affect the engine performance. Last night the truck was smoking black exhaust and had hesitation, wouldn't climb above 45 unless I downshifted. I ran the code and the 171 code came up. Is this a 02 sensor that went out you think?
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Wednesday, June 24th, 2009 AT 7:03 PM

3 Replies

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
The faulty cat. Converter has most likely caused the O2 sensors to fail, it is pretty common once the converter acts up.
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Wednesday, June 24th, 2009 AT 7:29 PM
Tiny
CARTMAN98
  • MEMBER
  • 2 POSTS
What is the best way to replace the cat? Aftermarket? Used? GM? I had the thing replaced maybe 2 years ago so I don't want the next one to go bad. Can salvage yards sell used cats?
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Wednesday, June 24th, 2009 AT 9:10 PM
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
If you recently replaced it then you may want to look into why it failed so quickly. Check out your EGR system and other emission systems. I suggest using the dealer brand, not sure if salvage yards can sale them or not.
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Wednesday, June 24th, 2009 AT 9:14 PM

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