1 Replace battery on non-working fob. 2. Verify battery is good when red light turns on on the fob after you slip new battery in 3. Open door or trunk with working fob 4. Hold down any "open" button (door or trunk) within range of car with non-working fob. 5. All of a sudden the non-working fob started working again AudiA4 / S4 (B9/8W; 2017-2019) fuses. In this article, we consider the fifth-generation Audi A4 / S4 (B9/8W), produced from 2017 to the present. Here you will find fuse box diagrams of Audi A4 and S4 , and 2019, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse Directlybelow are the common causes for the Audi A4 battery warning light. The potential fixes are presented in a good way to check your car. 1. Check The Serpentine Belt. Before testing your A4’s battery, examine the basic things. The serpentine belt that turns the alternator is top of the list. Seemsintact. - checked all major fuses inside the ecu box as well as under the Driverside kick panel, and the smaller ones in the Driverside fuse box, all intact. After everything the battery still doesn't show more than about 12.3 volts while running and the voltage doesn't increase when I rev it a bit. BatteryLocation? OK - I give up . I'm used to Audi putting things in weird places, but.. Where is the battery in these things? Yes, I did RTFM. In the index under MTZ47/H5. The Interstate MTZ absorbed glass-mat AGM car battery with Pure Matrix™ power feeds power-hungry vehicles while serving up powerful engine starts. With a 48-month free replacement warranty and longest-life performance, this car battery delivers lasting power for today’s high-accessory vehicles and motorists who use plug-ins such AccessBattery - Learn where the battery is located. 3. Remove Bracket - Take off the bracket that secures the battery. 4. Remove Cables - How to disconnect the cables the Part Battery. Operation: How to replace the battery in the Audi A4. In today's video we see how to remove the service battery in the Audi A4. This tutorial also .

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