Audi Back Up Light Switch (A5 Quattro S5 S4) - Genuine Audi 0B1941521B

Product Information

The back-up light switch is an electrical component that activates the reverse lights when the transmission is shifted into reverse gear. Mounted on the transmission or gear selector mechanism, it signals the vehicle’s lighting system to illuminate the rear back-up lamps, improving visibility and alerting others that the vehicle is reversing. Built with durable contacts and housings to withstand heat, vibration, and fluid exposure, the switch is essential for both safety and compliance with vehicle regulations.

• Reverse lights do not illuminate – often due to a failed or worn-out switch.
• Intermittent or flickering reverse lights – caused by loose connections or failing internal contacts.
• Check engine light or transmission-related fault codes – may appear if the switch malfunctions on electronically controlled systems.

About Genuine Audi

The original parts used by Audi to build your car are available as replacement parts under the “Genuine Audi” brand. Manufactured under the direction of Audi, expect excellent quality and a premium price since these parts are available exclusively through the Audi Dealership network.

You may not realize this, but the parts that make up your Audi are not necessarily manufactured by Audi. No cause for concern, as Audi designs the part, hires a manufacturer, and ensures its quality to you. In fact, many of these manufacturers have been making parts for Audi for decades. In our industry these manufacturers are called OEM (Original Equipment Manufacturers), and these are often brands you recognize, including Lemforder, ZF, Sachs, Bosch, Valeo, Zimmermann, Siemens VDO, Corteco, and more. Don’t be surprised to open that Genuine Audi parts box and find an OEM branded part inside, simply with the addition of an Audi logo.

Be sure to keep an eye out for OE tags on our product pages to quickly identify parts coming direct from OE manufacturers. That extra bit of insight could save you some serious money while shopping! Refer to our OE Academy for further information regarding the OE/OEM tags throughout the site.