HELLO I HAVE A CHECK ENGINE PO171 WHAT COULD IT BE HELP

Asked by Feb 21, 2019 at 01:48 PM about the 2008 GMC Envoy

Question type: Maintenance & Repair

I HAVE A CHECK ENGINE LIGHT HELP PO171
CODE IS PO171

1 Answer

2,935

I'm chasing this myself on my 06 TB. Start with the basics before you have a smoke test done. Make sure there are no leaks post MAF sensor. Clean MAF sensor. Make sure intake bolts are not loose (very very common). I've done all this, will have a smoke test done next, which should reveal I have a cracked intake manifold (it's plastic!) or leak there.

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