There are several light assemblies in a vehicle. Each of these light assemblies is installed in a certain manner and location for their respective function. The headlight is located at the front end so to light the road ahead while the tail light is found at the rear so to warn drivers behind you about your presence. The tail light also includes several other lightings such as parking lights, turn signal lights and brake lights. Now, at both sides of your Volvo S40 at the front, you will notice a small light. This is called the side marker light which helps you be seen by drivers who have your side profile. This is also important in the safety of both the driver and the passenger. Now, should you wish to customize or replace your Volvo S40 side marker light, Scan-Tech Products is ready to help you. Scan-Tech Products offers high-quality side marker and other lighting products for any model and model year of Volvo vehicles. Their wide array of Volvo side marker light includes great choices for Volvo S40 and you can be sure that they are all of great quality and performance. The Scan-Tech Products P9020-167810 side marker is available should you need a replacement for your 2001 Volvo S40 side marker.