Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Performing Vehicle System Test
-- Connect the Vehicle Diagnosis Tester. Refer to VEHICLE DIAGNOSIS TESTER, CONNECTING .
-- Switch on the ignition.
-- Select operating mode "Guided Fault Finding" on the display.
-- Then perform vehicle identification on the vehicle tester.
Program now performs a vehicle system test automatically and checks for all possible control modules for this vehicle type.
-- Press the → button.
Now all DTCs will be listed.
It useful at this point to switch to Guided Functions to perform further work with the Vehicle Diagnosis Tester and avoid a second identification on the Vehicle Diagnosis Tester.
To do so, press operating mode button and then Guided Functions.
Refer to the corresponding work descriptions for the continued sequence.
In order to return to Guided Fault Finding, press the operating mode button and then Guided Fault Finding.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.