WARNING
To prevent SERIOUS INJURY or DEATH to you or bystanders, always follow these precautions when working near or handling the battery:
Always read and
follow instructions carefully when handling a battery.
Wear eye protection
designed to protect the eyes from acid splashes.
Keep all flames,
sparks, or smoking materials away from the battery.
Hydrogen is always
present in battery cells, is highly combustible, and may explode if ignited.
Keep batteries out
of reach of children.
WARNING Batteries
contain sulfuric acid which is highly corrosive. Do not allow acid to contact your
eyes, skin or clothing.
If acid gets into your eyes, flush your eyes with clean water for at least 15 minutes and get immediate medical attention. If acid gets on your skin, thoroughly wash the area. If you feel pain or a burning sensation, get medical attention immediately.
WARNING
CALIFORNIA PROPOSITION 65 WARNING
Battery posts, terminals, and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer, birth defects and reproductive harm. Batteries also contain other chemicals known to the State of California to cause cancer. Wash hands after handling.
NOTICE

WARNING
Always follow these instructions when recharging your vehicle's battery to avoid the risk of SERIOUS INJURY or DEATH from explosions or acid burns:
By jump starting
After a jump start from a good battery, drive the vehicle for 20-30 minutes before it is shutoff. The vehicle may not restart if you shut it off before the battery had a chance to adequately recharge. See "Jump Starting" in chapter 6 for more information on jump starting procedures.
Information
An inappropriately disposed battery can be harmful to the environment and human health.
Dispose the battery according to your local law(s) or regulation.
Reset Features
The following items may need to be reset after the battery has been discharged or the battery has been disconnected.
Hyundai Elantra AD (2016-2020) Service Manual: Heated Oxygen Sensor (HO2S) Specifications
Specification
HO2S [Bank 1/Sensor 1] (Linear type)
ItemSpecificationHeater Resistance (?)2.4 ~ 4.0 [20°C(68°F)]
HO2S [Bank 1/Sensor 2] (Binary type)
A/F Ratio (?)Output Voltage(V)RICH0.6 ~ 1.0LEAN0 ~ 0.4
ItemSpecificationHeater Resistance (?)Approx. 9.0 [20°C(68°F)]
...
Hyundai Elantra AD (2016-2020) Service Manual: Repair procedures
Compression Pressure Inspection
•
If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
1.
Warm up and stop engine.
Allow the engine to warm up to normal operating temperature.
2.
Disconnect the injec ...