How to Replace an Audi S4 Fuel Pump Relay
Most automotive relays plug into a socket, and that's the case for the Audi S4 fuel pump relay. The hardest part of replacing the S4's fuel pump relay lies mainly in finding where it's located. Audi made the S4 for several years, so the location and type of replacement part can vary. Consult your owner's manual for your particular S4 to find the location. But to find a replacement part, simply search any online auto parts distributor for the relay itself.
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Instructions
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Locate your fuel pump relay. Look in your owner's manual. If you can't find the information there, look under the hood for a power distribution box that contains fuses, circuit breakers and relays. The cover should lift off after loosening the snaps. Your fuel pump relay should be marked, or it may be diagrammed on the inside of the cover.
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Pull the relay out of the socket by lifting up on it. You don't need any tools.
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Push the new relay into the socket after lining up the pins to mate with the socket. It will fit only one way, so you can't make a mistake.
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Tips & Warnings
Several manufacturers make replacement fuel pump relays for your Audi S4 at a wide variety of prices online. Two examples are the standardbrand.com website and shop.oreillyauto.com. Fill in or use drop-down menus to find the S4 for your year model. Or shop at your favorite parts store.
If you work under the hood with the engine running, you risk injury. Shut it off and let it cool before working.
