| Troubleshooting |

Battery Repair procedures
Battery Sensor Description and OperationHyundai Elantra AD (2016-2020) Service Manual: Heated Oxygen Sensor (HO2S) Description and Operation
Description
Heated Oxygen Sensor (HO2S) consists of zirconium and alumina
and is installed both upstream and downstream of the Catalytic
Converter. It 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 ...
Hyundai Elantra AD (2016-2020) Service Manual: Brake Line Repair procedures
Removal
1.
Disconnect the negative (-) battery cable.
2.
Disconnect the brake fluid level switch connector.
3.
Remove the brake fluid from the master cylinder reservior with a syringe.
•
Do not spill brake fluid on the vehicle, it may damage the
paint; if br ...