Using this F1 rear fog lamp is straightforward. First, lay out all the hardware and the wiring harness. Install the lamp on your 2015 - 2021 Subaru WRX or STI. Make sure to find a good route for the wiring harness so that water won't get inside the vehicle. Then, plug in the harness and test all the functions. You can enable or disable the F1 blinking according to the included instructions. When it comes to maintenance, keep the lamp clean. Wipe it regularly with a soft, dry cloth to remove dirt and debris. Avoid using abrasive materials that could scratch the lamp. If you notice any issues with the functions or the wiring, check the connections first. If the problem persists, it might be a good idea to consult a professional.