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Question # 43

A car sets P0171 (System Too Lean Bank 1). STFT is +25% at idle but normal under load. Fuel pressure is fine. What is the most likely cause?

Options:

A.

Intake manifold gasket leak on Bank 1

B.

Dirty injector

C.

Faulty O2 sensor

D.

Weak fuel pump

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L1 Overview

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

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