Disconnecting the battery is only allowed when the ignition is off. If your car has a radio with security coding, you must know the security code before disconnecting the battery.
Follow all necessary instructions after connecting the battery.
A voltage of at least 11.5 V is required to keep the electrical components working flawlessly.
Do not use sealants containing silicone. Silicone elements sucked in by the engine do not burn through and damage the lambda probes.
At the end of the work, interrogate the fault memory of the engine control unit, delete all records of faults that may have arisen as a result of checks and repair work. After clearing the fault memory, generate an OBD code.
If, after troubleshooting, repairs or component checks, the engine only turns on for a short time and then turns off again, this indicates that the engine control unit is blocked by the immobilizer. In this case it is necessary to adapt the control unit «Gefuehrte Funktion/Guided Functions».
Vehicles with airbags are equipped with a collision fuel cut-off system. It is intended to reduce the risk of vehicle fire after a collision by disabling the fuel pump by the fuel pump control unit.
When the door is opened, the fuel pump turns on for 2 seconds to pressurize the fuel system. This improves comfort when starting the engine.
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