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Question # 18

An engine exhibits poor idle quality and lean codes (P0171/P0174) on both banks. Smoke testing reveals no vacuum leaks. Fuel pressure is steady and correct. What should be checked next?

Options:

A.

Mass airflow (MAF) sensor contamination

B.

Catalytic converter restriction

C.

EGR valve pintle stuck closed

D.

Idle air control valve failure

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L1 Overview

Name Automotive Service Excellence Level 1
Code L1
Vendor Skilled Trades
Certification ASE

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