Hydrofluoric acid
This highly toxic and corrosive substance is formed when certain types of synthetic rubber, which are used to make some sealing rings, cuffs, fuel hoses, etc., are heated above 400°C. The rubber is charred or turns into a solid substance containing fluoric acid. This acid is very stable and does not decompose for years. When this acid gets on the skin, it is sometimes necessary to amputate the affected organ.
If you have to repair a vehicle damaged by fire or handle parts removed from such a vehicle, wear protective gloves and destroy them after work.
Battery
The battery contains sulfuric acid, which is extremely dangerous to skin, eyes and clothing. Be careful when filling and carrying the battery.
Information copied from the website MercedesMan
Hydrogen gas that may be released from the battery is explosive. Avoid open flames and avoid sparks near the battery. Be careful when connecting and disconnecting the charger and other portable cables.
Air safety bags
The air bag may cause injury if deployed unexpectedly. Be careful when removing the steering wheel and instrument panel. Follow the bag handling instructions.
Fuel equipment for diesel engines
The diesel fuel pump creates very high pressure. Be careful when working with the pump and injectors.
Warning: Never expose your hand, face or any other part of your body to the fuel jet from the nozzle; fuel may penetrate your skin, causing death.
Remember...
What should be done
Protect your eyes when using power tools and when working under machines.
Use gloves or barrier cream if necessary.
If you work alone, ask someone to check in on you from time to time to make sure you are okay.
Keep loose clothing and long hair away from moving parts of the machine.
Before working on the vehicle, especially on electrical circuits, remove rings, watches, etc.
Before using lifting and supporting equipment, ensure that it is of sufficient strength for the intended work.
What not to do
Don't try to lift something that is beyond your capabilities - call for an assistant.
Don't rush to finish your work - take breaks.
Do not use a faulty tool - it may break off and cause injury.
Don't leave the tool lying around on the floor - someone might trip over it. Wipe up any spilled oil immediately.
Do not allow children or pets to play in or near the vehicle being worked on.