O2 Sensors

A conventional oxygen sensor heater uses about ________ amps.

-0.8 to 2.0

-8 to 10

-More than 10

-0.5 or less

• 0.8 to 2.0

• 8 to 10

• More than 10

• 0.5 or less

A heated zirconia oxygen sensor will have how many wires?

-2

-3

-4

-Either B or C

• 2

• 3

• 4

• Either B or C

A high O2S voltage could be due to ________.

-A rich exhaust

-A lean exhaust

-A defective spark plug wire

-Both A and C

• A rich exhaust

• A lean exhaust

• A defective spark plug wire

• Both A and C

A large amount of oxygen in the exhaust system causes the O2S to produce which of these?

-High voltage

-Low voltage

-False readings

-Abnormal readings

• High voltage

• Low voltage

• False readings

• Abnormal readings

A low O2S voltage could be due to ________.

-A rich exhaust

-A lean exhaust

-A defective spark plug wire

-Both B and C

• A rich exhaust

• A lean exhaust

• A defective spark plug wire

• Both B and C

A wide band oxygen sensor heater can draw how much current (amperes)?

-0.8 to 2.0 A

-2 to 4 A

-6 to 8 A

-8 to 10 A

• 0.8 to 2.0 A

• 2 to 4 A

• 6 to 8 A

• 8 to 10 A

A wide band oxygen sensor is capable of detecting the air-fuel mixture in the exhaust from ________ (rich) to ________ (lean).

-12:1 to 15:1

-13:1 to 16.7:1

-10:1 to 23:1

-8:1 to 18:1

• 12:1 to 15:1

• 13:1 to 16.7:1

• 10:1 to 23:1

• 8:1 to 18:1

A wide band oxygen sensor needs to be heated to what operating temperature?

-600 deg. F

-800 deg. F

-1,400 deg. F

-2,000 deg. F

• 600 deg. F

• 800 deg. F

• 1,400 deg. F

• 2,000 deg. F

An oxygen sensor is being tested with a digital multimeter using the MIN/MAX function. The readings are: minimum = 78 mV; maximum = 932 mV; average = 442 mV. Technician A says that the engine is operating normally. Technician B says that the oxygen sensor is skewed too rich. Which technician is correct?

• Tech A

• Tech B

• Both Tech's A and B

• Neither Tech

On a poorly running engine the wide band oxygen sensor can be quickly checked by ________.

-Jumping the connector with a flashlight battery

-Jumping the connector with a jumper wire

-Disconnecting the sensor connector

-Disconnecting the vehicle battery

• Jumping the connector with a flashlight battery

• Jumping the connector with a jumper wire

• Disconnecting the sensor connector

• Disconnecting the vehicle battery