Oxygen Sensor Testing and Functions

The video tutorial by Easy AutoFix explains how to test oxygen sensors in vehicles, focusing on narrowband zirconia types. It covers the function and placement of oxygen sensors, their role in measuring oxygen levels in the exhaust system, and how they communicate with the ECM to adjust fuel levels. The tutorial provides step-by-step instructions for testing narrowband sensors using a multimeter and for testing sensors with a heater. It also offers tips for maintaining sensor functionality and ensuring accurate readings.

What are the two main types of oxygen sensors discussed?

• Narrowband and wideband

• Zirconia and titania

• Heated and unheated

• Single-wire and multi-wire

What is the primary function of a narrowband zirconia oxygen sensor?

• To measure fuel efficiency

• To measure the amount of oxygen in the exhaust system

• To monitor the catalytic converter

• To control the engine temperature

Where is the oxygen sensor typically located in a vehicle?

• In the fuel tank

• Before and after the catalytic converter

• In the air intake system

• Near the engine block

What should the voltage reading fluctuate between when testing an oxygen sensor before the catalytic converter?

• 0.2 to 0.6 volts

• 0.1 to 0.5 volts

• 0.3 to 0.8 volts

• 0.5 to 1.0 volts

What does a constant voltage reading of 450 millivolts indicate when testing an oxygen sensor?

• A properly functioning sensor

• A rich air-fuel mixture

• A lean air-fuel mixture

• A malfunctioning sensor

What could cause a high voltage reading in an oxygen sensor?

• A broken fuel pump

• A lean air-fuel mixture

• A rich air-fuel mixture

• A faulty catalytic converter

What is the first step in testing an oxygen sensor with a heater?

• Check the fuel level

• Start the engine

• Set the multimeter to 200 ohms

• Disconnect the battery

What should you do if there is no reading when testing the heater of an oxygen sensor?

• Clean the catalytic converter

• Replace the sensor

• Check the fuel injectors

• Adjust the air-fuel ratio

What is a sign of a good heater in an oxygen sensor?

• A reading within the specified range

• A fluctuating reading

• A constant reading of 0 volts

• No reading on the multimeter

What should you check if the oxygen sensor's heater is not working?

• The fuel injectors

• The engine oil level

• The air filter

• The wires and connectors