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The engine light came on yesterday, the Autozone diagnostic tool read P0171 and provided 4 possible items to troubleshoot.

After opening up the hood and listening to the engine I think there is a leak coming from the part circled.

My question is this, does this part typically fail and is this part designed to allow air in. When I place my hand on or cup the part with my hand the part circled I can tell there is a decrease in air flow.

Please let me know where I should begin. I dont want to start replacing working parts incorrectly.

Audi 04 A4 1.8T Engine Noise - YouTube
 

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