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I have 2003 GMC Envoy SLE. It’s throwing a p0172 code. I checked the fuel pressure and everything was fine. So I know it’s not the fuel system. Checked for vaccum leaks and nothing. I checked the sensors and nothing. Does anyone know what it might be?
 

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Read this thread - Code P0172 ??

If you have the 4.2L inline 6 engine, there is no MAF sensor.

Good Luck!
 
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