Oxygen Sensors Quiz

What is the purpose of an oxygen sensor in the exhaust system?

• To measure the amount of nitrogen in the exhaust

• To create a closed loop operation for the air fuel ratio

• To monitor the tire pressure

• To regulate the temperature of the exhaust

What information does the ECU use to determine the proper air fuel ratio?

• Throttle position sensor and tire pressure sensor

• Fuel level sensor and engine temperature sensor

• Mass sensor and air intake temperature sensor

• Brake position sensor and oil temperature sensor

What does the oxygen sensor do if it detects oxygen in the exhaust?

• It tells the ECU to inject more fuel

• It tells the ECU to decrease the air intake

• It tells the ECU to inject less fuel

• It tells the ECU to increase the air intake

Where is the first oxygen sensor located in the exhaust system?

• After the turbocharger

• After the muffler

• Before the catalytic converter

• Before the air filter

What does the voltage spike in the oxygen sensor indicate to the ECU?

• The exhaust temperature

• The air fuel mixture

• The engine temperature

• The tire pressure

What is the purpose of the second oxygen sensor after the catalytic converter?

• To measure the exhaust temperature

• To measure the efficiency of the catalytic converter

• To regulate the air fuel ratio

• To monitor the oil level

What happens if the oxygen sensor detects a high voltage spike?

• The ECU injects less fuel

• The ECU increases the air intake

• The ECU decreases the air intake

• The ECU injects more fuel

What does the second oxygen sensor read after the catalytic converter?

• The same voltage as the first sensor

• A lower voltage than the first sensor

• A higher voltage than the first sensor

• No voltage at all

What is the ideal air fuel ratio for the engine?

• 7:1

• 20:1

• 14.7:1

• 10:1

What does the ECU do if the oxygen sensor reads a lower voltage?

• Injects more fuel

• Injects less fuel

• Increases the air intake

• Decreases the air intake