Oxygen Sensors and Engine Management Quiz

What is the Greek letter used to refer to the stoichiometric air/fuel ratio?

• Alpha

• Beta

• Lambda

• Gamma

What happens when the air/fuel ratio is greater than 14.7:1?

• The engine will have a rich fuel mixture

• The engine will have a lean mixture

• The engine will overheat

• The engine will produce more power

What is a potential consequence of lean mixtures in engines?

• Increased fuel economy

• Increased oxides of nitrogen (NOX) emissions

• Reduced engine temperature

• Increased engine power

What is a potential consequence of rich mixtures in engines?

• Increased carbon monoxide (CO) emissions

• Reduced fuel economy

• Increased engine temperature

• Increased engine power

What is the Bosch LSU 4 wideband oxygen sensor capable of reading?

• The temperature of the exhaust

• The exact air/fuel ratio

• The pressure in the exhaust

• The level of carbon dioxide in the exhaust

What is the purpose of the Nernst cell in the Bosch LSU 4 wideband air/fuel ratio sensor?

• To measure the temperature of the exhaust

• To sense oxygen levels in the exhaust

• To control the fuel injection timing

• To monitor the engine oil level

What is the stoichiometric air/fuel ratio mentioned in the text?

• 11:1

• 14.7:1

• 7:1

• 2:1

What does the wideband oxygen sensor produce when the air/fuel mixture is rich?

• Positive current

• Negative current

• 0.45 volts

• 0.9 volts

What is a significant challenge with conventional oxygen sensors in meeting new emission standards?

• They are too expensive

• They warm up too quickly

• They can't provide the exact air/fuel ratio

• They produce too much voltage

What should be done if a Bosch wideband oxygen sensor fails due to unusual operating conditions?

• It should be replaced

• It should be cleaned

• It should be recalibrated

• It should be reset