Hyundai Elantra: Removal - Transaxle 
Oil Temperature Sensor. Repair procedures - Automatic Transaxle Control System - Automatic Transaxle System - Hyundai Elantra MD 2010-2015 Service manualHyundai Elantra: Removal

1.
Disconnect the negative (-) battery cable.
2.
Remove the air cleaner assembly and air duct.
(Refer to Engine Mechanical System - "Intake and Exhaust system")
3.
Remove the under cover (A).

Tightening torque:
6.9 ~ 10.8 N.m (0.7 ~ 1.1 kgf.m, 5.1 ~ 8.0 lb-ft) )

4.
Replace new gasket and the plug after draining the automatic transaxle fluid by removing the drain plug.
(Refer to Hydraulic System - "Fluid")
5.
Remove the air breather hose (A).
6.
Remove the valve body cover (B).

Tightening torque:
13.7 ~ 15.7 N.m (1.4 ~ 1.6 kgf.m, 10.8 ~ 11.6 lb-ft)

7.
Disconnect the oil temperature sensor connector (A).

8.
Remove the oil temperature sensor (A) after removing a bolt.

Tightening torque:
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)