This indicator light is part of the Engine Control System which monitors various emission control system components. If this light illuminates while driving, it indicates that a potential malfunction has been detected somewhere in the emission control system.
This light will also illuminate when the ignition switch is turned to the ON position, and will go out in a few seconds after the engine is started. If it illuminates while driving, or does not illuminate when the ignition switch is turned to the ON position, take your vehicle to your nearest authorized HYUNDAI dealer and have the system checked.
Generally, your vehicle will continue to be drivable, but have the system checked by an authorized HYUNDAI dealer promptly.
CAUTION
Hyundai Tucson (LM) 2010-2015 Service Manual: Rear Assist Arm Repair procedures
Replacement
1.
Remove the rear wheel & tire.
Tightening torque :
88.3 ~ 107.9N.m (9.0 ~ 11.0kgf.m, 65.1 ~ 79.6lb-ft)
Be careful not to damage to the hub bolts when removing the rear wheel & tire.
2.
Remove the sprit pin and castle nut or bolt and then ...
Hyundai Tucson (LM) 2010-2015 Owners Manual: 135,000 miles (216,000 km) or 108 months
Rotating tires
Inspect air cleaner filter
Inspect vacuum hose
Inspect air conditioning refrigerant
Inspect brake hoses and lines
Inspect drive shafts and boots
Inspect exhaust pipe and muffler
Inspect front brake disc/pads, calipers
Inspect propeller shaft (AWD)
Inspect rear bra ...