2018 WRX TGV Delete Reset OBD2

Deleting the Tumble Generator Valves (TGVs) on your 2018 WRX can offer potential performance gains, but it also triggers a check engine light. Understanding how to reset your OBD2 system after a 2018 WRX TGV delete is crucial for passing emissions and monitoring your car’s performance. This article will guide you through the process and provide essential information on TGV deletes and OBD2 resets.

Understanding the 2018 WRX TGV Delete

The TGVs are designed to improve emissions during cold starts. They restrict airflow, creating a swirl effect that promotes more complete combustion. While beneficial for emissions, they can also restrict airflow at higher RPMs. A TGV delete removes these valves, potentially improving throttle response and top-end power. However, this modification will trigger the check engine light because the ECU detects the missing valves.

Why Reset Your OBD2 After a 2018 WRX TGV Delete?

Resetting your OBD2 system after a 2018 WRX TGV delete is essential for several reasons:

Clearing the Check Engine Light: The most obvious reason is to extinguish the persistent check engine light that illuminates after the TGV delete.
Monitoring Performance: A reset allows the ECU to adapt to the changes and establish new baselines. This enables you to accurately monitor your car’s performance after the modification.
Passing Emissions Tests: Depending on your region, a check engine light can prevent you from passing emissions tests. Resetting the OBD2 system, combined with a proper tune, can help you comply with regulations.

How to Reset Your OBD2 System After a 2018 WRX TGV Delete

There are two primary methods for resetting your OBD2 system:

1. Using an OBD2 Scanner

Using an OBD2 scanner is the most reliable and efficient method. Here’s a step-by-step guide:

Plug the OBD2 scanner into the diagnostic port located under the steering wheel.
Turn the ignition to the “on” position (do not start the engine).
Follow the scanner’s prompts to read the error codes. This confirms that the codes relate to the TGV delete.
Select the option to clear the codes. The exact wording may vary depending on the scanner.
Turn the ignition off and wait for a few minutes.
Restart the engine and check if the check engine light has been extinguished.

2. Battery Disconnect Method

The battery disconnect method is a less precise approach, and it’s generally recommended to use an OBD2 scanner instead. However, if a scanner is unavailable, here’s how to do it:

Disconnect the negative terminal of the car battery.
Wait for at least 30 minutes to allow the ECU’s memory to clear.
Reconnect the negative terminal.
Start the engine and check if the check engine light is gone.

This method can also reset other learned settings in the ECU, so it’s not ideal.

The Importance of Tuning After a TGV Delete

Simply resetting your OBD2 system after a 2018 WRX TGV delete is not a complete solution. While it might temporarily extinguish the check engine light, the underlying issue remains. A proper tune is essential to recalibrate the ECU for the modified airflow and prevent further issues. A professional tune optimizes fuel delivery and ignition timing, ensuring optimal performance and preventing potential engine damage.

Conclusion

Resetting your OBD2 system after a 2018 WRX TGV delete is a necessary step, but it’s only part of the process. Combining the reset with a professional tune ensures your WRX performs optimally and remains reliable. Remember, using an OBD2 scanner is the preferred method for resetting the system.

FAQ

Will resetting my OBD2 system damage my car? No, resetting the OBD2 system is a safe procedure that won’t harm your vehicle.
Can I drive with the check engine light on after a TGV delete? While you can technically drive with the light on, it’s not recommended. It’s crucial to get a proper tune to avoid potential engine damage.
How much does a professional tune cost? Tuning costs vary but typically range from $400 to $800.
What type of OBD2 scanner should I use? A quality OBD2 scanner with code reading and clearing capabilities will suffice.
Will disconnecting the battery reset other settings in my car? Yes, disconnecting the battery can reset various settings, including radio presets and clock settings.

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