Hyundai Tucson: Engine Control System / Heated Oxygen Sensor (HO2S) Description and Operation
Heated Oxygen Sensor (HO2S) consists of zirconium and alumina
and is installed both upstream and downstream of the Manifold Catalytic
Converter. The sensor output voltage varies in accordance with the
air/fuel ratio.
The sensor must be hot in order to operate normally. To keep
it hot, the sensor has a heater which is controlled by the ECM via a
duty cycle signal. When the exhaust gas temperature is lower than the
specified value, the heater warms the sensor tip.

Removal
1.
Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2.
Remove the intake manifold.
(Refer to Engine Mechanical System - “Intake And Exhaust System”)
...
Specification
HO2S [Bank 1/Sensor 1] (Linear type)
ItemSpecificationHeater Resistance (x)2.4 ~ 4.0 [20°C(68°F)]
HO2S [Bank 1/Sensor 2] (Binary type)
A/F Ratio (x)Output Voltage(V)RICH0.6 ~ ...
Other information:
Hyundai Tucson (LM) 2010-2015 Owners Manual: Ignition switch
WARNING
To reduce the risk of SERIOUS INJURY or DEATH, take the following precautions:
NEVER allow children or any person who is unfamiliar with the vehicle
to touch the ignition switch or related parts. Unexpected and sudden vehicle
movement can occur.
NEVER reach through the steering ...
Hyundai Tucson (LM) 2010-2015 Owners Manual: Using the Room Mirror Key
Selecting the room mirror key will allow you to make service required inquiries,
POI info searches, and emergency rescues by connecting to the Blue Link® Center.
Such features can be used only after subscribing to the Blue Link® service.
➀ (Blue Link® Center)
Makes requests for Bl ...