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The Start-Stop feature in modern vehicles is designed to enhance fuel efficiency by automatically shutting off the engine when the car is stationary and restarting it when the driver is ready to move. However, many drivers find this feature disruptive, especially in urban driving conditions. For owners of the 2017 Porsche 991.2 Turbo S, there is a way to configure the Start-Stop system to default to OFF using the PIWIS 2 diagnostic tool. This article will provide a detailed guide on how to achieve this configuration.

Understanding the PIWIS 2 Diagnostic Tool

The PIWIS 2 (Porsche Integrated Workshop Information System) is a sophisticated diagnostic tool used by Porsche technicians to access, diagnose, and program various vehicle functions. It provides detailed information about the vehicle's systems and allows for the modification of settings, including the Start-Stop feature. Before you begin, ensure you have access to the PIWIS 2 tool, which may require a visit to a dealership or a specialized automotive workshop（Autonumen.com）.

Requirements

1. PIWIS 2 Diagnostic Tool: Ensure you have the latest version of the software for compatibility with your 2017 Porsche 991.2 Turbo S.
2. Vehicle Access: The vehicle should be in a secure location, preferably with the engine off and the ignition in the ON position.
3. Basic Understanding of Vehicle Programming: Familiarity with the PIWIS 2 interface will be beneficial.

Steps to Disable Start-Stop Default

Here’s a step-by-step guide to configure the Start-Stop feature to default to OFF:

Step 1: Connect PIWIS 2 to the Vehicle

1. Connection: Connect the PIWIS 2 tool to the OBD-II port of your Porsche 991.2 Turbo S. The OBD-II port is usually located under the dashboard on the driver's side.
2. Power On: Turn on the PIWIS 2 tool and wait for it to establish a connection with the vehicle.

Step 2: Access Vehicle Configuration

1. Select Model: From the main menu, select your vehicle model (991.2 Turbo S).
2. Diagnostic Functions: Navigate to the diagnostics section to access various vehicle settings.

Step 3: Locate Start-Stop Settings

1. Control Units: Find the control unit associated with the engine management system. This is typically labeled as the Engine Control Unit (ECU).
2. Coding/Programming: Enter the coding or programming menu for the ECU.

Step 4: Modify Start-Stop Default Setting

1. Find Start-Stop Parameter: Look for the parameter related to the Start-Stop feature. It may be labeled as “Start-Stop Default” or something similar.
2. Change Setting: Change the setting from “ON” to “OFF” or select the option that specifies the system should default to OFF when the vehicle starts.

Step 5: Save Changes

1. Confirm Changes: After modifying the parameter, confirm the changes in the PIWIS 2 interface.
2. Exit Programming Mode: Safely exit the programming mode and disconnect the PIWIS 2 tool from the vehicle.

Step 6: Test the Configuration

1. Start the Vehicle: Start your vehicle and allow it to idle.
2. Check Start-Stop Functionality: Confirm that the Start-Stop feature does not engage automatically when the vehicle comes to a stop.

Troubleshooting

If the Start-Stop feature still defaults to ON after performing the above steps, consider the following troubleshooting tips:

- Software Update: Ensure that your PIWIS 2 software is up to date, as older versions may not support certain configurations.
- Revisit Settings: Double-check that you accurately followed all steps and saved the changes.
- Consult a Professional: If issues persist, it may be beneficial to consult a Porsche technician or specialist who can assist further.



Configuring the Start-Stop feature to default to OFF on a 2017 Porsche 991.2 Turbo S using the PIWIS 2 diagnostic tool is a straightforward process that can enhance your driving experience. By following the outlined steps, you can effectively disable this feature, allowing for a more personalized vehicle performance suited to your driving preferences. Always remember to exercise caution when making changes to vehicle settings and consult a professional if you're uncertain about any steps in the process.