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2000 GMC Sierra PO174 code on bank 2

Tiny
09CHEVYMAN
  • MEMBER
  • 2000 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
I have po174 code on bank 2 but I cannot find the problem but I do have a big exhaust leak between the manifold and the head pipe on bank 2 would that cause a lean mixture. Please help me as much as you can. Thanks.
Wednesday, March 31st, 2010 AT 6:57 PM

1 Reply

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Yep a faulty exhaust system will definitely cause this code to appear. May also want to check the oxygen sensors out, if wiring is OK then test the sensors themselves, they will also set this code.
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Wednesday, March 31st, 2010 AT 7:04 PM

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