Question

Technician A says that a cracked exhaust manifold can affect oxygen sensor operation. Technician B says that a clogged air filter element won't affect emissions. Who is correct?

A. Both Technicians A and B
B. Technician B
C. Neither Technician A nor B
D. Technician A

Answer 1

A cracked exhaust manifold affects oxygen sensor operation, while a clogged air filter element affects emissions.

Step-by-step explanation:

The correct answer is Technician A. A cracked exhaust manifold can definitely affect oxygen sensor operation. The oxygen sensor measures the amount of oxygen in the exhaust gases, and a cracked exhaust manifold can lead to an incorrect oxygen reading, resulting in poor engine performance and increased emissions.

Technician B is incorrect. A clogged air filter element can certainly affect emissions. The air filter helps to clean the air before it enters the engine, and a clogged filter can restrict airflow, leading to a rich fuel mixture and increased emissions.

Therefore, Technician A is correct in stating that a cracked exhaust manifold affects oxygen sensor operation, while Technician B is incorrect in stating that a clogged air filter element won't affect emissions.

Answer 2

tech A only

Step-by-step explanation:

Technician A is right because a cracked exhaust manifold allows more oxygen into the exhaust stream, which affects oxygen sensor voltage. Technician B is wrong because a clogged air filter raises Hydrocarbons (HC) and also affects O2 (Oxygen) and CO (Carbon Monoxide) levels.