Safety Precautions

Safety Precautions

Note the following when working on the fuel system:


There is a risk of injury because the fuel is under pressure.

• Place clean rags around the connection before opening the system. Then release pressure by carefully loosening the connection.

• Wear protective gloves.

• Wear safety glasses.

Very hot fuel can burn your skin.

• The temperature of the fuel lines and may reach 100 °C (212 °F) after stopping the engine. Let the fuel cool down before opening any line connections otherwise there is a danger of scalding.

• Wear protective gloves.

• Wear safety glasses.

To prevent personal injury and damage to the injection and pre-glow system, observe the following:

• The ignition must be switched off before connecting or disconnecting injection and pre-glow system wiring or tester cables.

• Only clean engine with ignition switched off.

• Since the engine was started while the electrical connectors were disconnected, the following fault will be stored in the engine control module: check the DTC memory in OBD => Vehicle Diagnosis Tester.


Risk of destroying electrical components when battery is disconnected.

• Observe measures when disconnecting battery.

• Only disconnect battery with ignition switched off.

- Disconnect the battery.

Note the following when working on the cooling system:


Risk of scalding due to hot steam and hot coolant.

• When the engine is warm the cooling system is under pressure.

• To reduce pressure, cover coolant reservoir cap with cloth and carefully open.

When working on a vehicle with the Start/Stop System, note the following:


Danger of serious personal injury if the engine starts automatically on vehicles with the Start/Stop System.

• If the Start/Stop System is activated (message in the instrument cluster), the engine can start automatically.

• Make sure the Start/Stop System is deactivated whenever working on the vehicle. Switch off the ignition and switch it on only when necessary.

If it is necessary to use testing and measuring devices on a road tests, observe the following:


Distraction and improperly secured test equipment can lead to accidents.

There is a risk that the passenger airbag could deploy in a collision.

• Operating testing and measuring equipment while driving creates a distraction.

• There is an increased risk of injury due to unsecured testing and measuring equipment.

• Always secure testers on the rear seat with a strap and have a second person on the rear seat to operate them.

Note the following when working on the exhaust system:


Danger of damaging the decoupling element.

• Decoupling element must not be bent more than 10°.

• Do not load decoupling element on cable.

• Do not damage wire mesh at decoupling element.