What is indicated if the oxygen sensor voltage is cycling back and forth across the stoichiometric value several times per second?
A) The air-fuel ratio is too lean and the voltage cannot stabilize
B) The air-fuel ratio is too rich and the voltage cannot stabilize
C) The computer is properly controlling the air-fuel ratio
D) The computer is malfunctioning

Question

Quizplus · Accepted Answer

The cycling of the oxygen sensor voltage across the stoichiometric value indicates that the engine's computer is actively adjusting the air-fuel mixture to maintain optimal combustion conditions, which is a sign of proper functioning.

What Is Indicated If the Oxygen Sensor Voltage Is Cycling