A customer isn’t sure what an oxygen sensor in the exhaust system does – how would you explain it?

A) It controls the air/fuel ratio to improve vehicle performance

B) It detects dangerously combustive levels of oxygen in parts of the engine where there should be no oxygen flow.

C) It measures the air/fuel ratio to see if it’s rich or lean, which can affect vehicle performance.

D) It regulated the recirculation of oxygen within the engine.

Answer C

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