A Downstream Oxygen (O₂) Sensor Is Reading the Same as the Upstream

question 9

Multiple Choice

A downstream oxygen (O₂) sensor is reading the same as the upstream O₂ sensor. What does this indicate?

• A) The downstream sensor is defective and must be replaced.
• B) The converter has low efficiency.
• C) The upstream sensor is not working properly.
• D) The converter is working properly.

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