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P0171 / P0174 codes

cashflow50

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cashflow50 Enthusiast

cashflow50

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2003 GMC Yukon 4.8L

 

Don’t have those scanners that gives you extra data, just got a simple one that gives you the codes only. Well I’ve researched that it’s mainly a vacuum leak issue. I’ve checked all vacuum hoses and even used a smoker and can’t seem to find where the problem is. Is there a common area where this leak occurs? Man it’s like finding a needle in a haystack. Need help from the gm gurus. Thanks

 

 

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