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.
Work procedure
- Connect diagnostic tester; see DIAGNOSTIC TESTER, CONNECTING .
- Switch ignition on.
- Wait 5 seconds.
- Let engine run at idle.
- Wait 45 seconds.
- Perform a road test.
The following operating conditions must be met during this road test:
- With accelerator pedal depressed completely, accelerate vehicle in 3. gear or in driving mode "3" from 50 km/h to 120 km/h.
- Drive for 2 minutes in 4. gear or in driving mode "D" on a level driving surface at a constant vehicle speed with an engine speed of 1700 to 1900 RPM.
Observe the safety precautions that apply to road tests; see SAFETY PRECAUTIONS .
- Vehicle speed, see DIAGNOSTIC MODE 1: CHECK MEASURED VALUES ; PID 13, Vehicle speed.
- Engine speed, see DIAGNOSTIC MODE 1: CHECK MEASURED VALUES ; PID 12, engine rotations per minute (RPM).
- Park vehicle and switch off ignition.
- Wait 15 seconds.
- Switch ignition on.
- Wait 5 seconds.
- Let engine run at idle.
- Wait 45 seconds.
- Perform a road test anew.
The following operating conditions must be met during this road test:
- With accelerator pedal depressed completely, accelerate vehicle in 3. gear or in driving mode "3" from 50 km/h to 120 km/h.
- Drive for 2 minutes in 4. gear or in driving mode "D" on a level driving surface at a constant vehicle speed with an engine speed of 1700 to 1900 RPM.
Observe the safety precautions that apply to road tests; see SAFETY PRECAUTIONS .
- Park vehicle and let engine run at idle for 3 minutes.
- Accelerator pedal must not be operated during this time.
- Read readiness code, see READ READINESS CODE .
If a 1 is displayed instead of a 0 in the 8-digit number block:
- Repeat complete work procedure, see WORK PROCEDURE
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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.