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Question # 1

A car sets P0430 (Catalyst Efficiency Below Threshold Bank 2). Upstream O2 sensor switches normally, downstream mimics it. What is the fault?

Options:

A.

Failed Bank 2 catalytic converter

B.

Faulty O2 sensor heater

C.

Exhaust manifold leak

D.

Vacuum leak

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L1 Overview

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

L1 Questions