The starter relay is in the engine compartment fuse/relay box on the driver’s side, labeled as the Starter/Anlasser.
In the 2006 Audi A4 (B7) family, which includes several engine options (such as 1.8T, 2.0T, and 3.2), the starter relay is part of the main under-hood fuse box. The exact position is shown on the diagram inside the relay box lid. Even if the battery sits in the trunk, the starter relay is typically still housed in the engine bay fuse box. Always verify with the lid diagram or the owner’s manual before removing or swapping relays.
Location and how to identify the starter relay
The following steps guide you to the exact relay using the fuse/relay box diagram. Note that relay numbers can vary by engine type and market; rely on the diagram on the box cover to confirm the function.
Before you start the search, locate the engine bay fuse/relay box: a black plastic box with a removable lid, usually near the driver's side strut tower or along the firewall. Inside, you’ll find several relays and fuses, typically arranged in a grid with a schematic on the underside of the lid or inside the box.
- Open the fuse box lid and read the diagram for a label such as "Starter," "Anlasser," or a relay designated for starting. The lid may label the relay with a number (for example, it could be numbered 50, 87, or another designation depending on the region and engine type).
- Identify the relay by its position on the diagram and confirm its function with the wiring notes (the starter relay controls power to the starter solenoid when the ignition is turned on).
- If needed, trace the wiring from the ignition switch to the relay to confirm which terminal switches power to the starter circuit.
Conclusion: In most 2006 Audi A4 configurations, the starter relay sits in the engine compartment fuse/relay box on the driver’s side, and it is labeled on the lid diagram as the starter or Anlasser. If your model uses a nonstandard layout, consult the diagram or service manual for the exact reference.
Alternative checks and safety reminders
Before touching electrical components, ensure the ignition is off and, if you’re working around power, disconnect the battery to prevent shocks or short circuits. If you suspect a faulty starter relay, you can swap it with another identical relay in the same box to test, or use a multimeter to check coil resistance and contact continuity, following proper safety precautions.
Summary
For a 2006 Audi A4, the starter relay is typically located in the engine compartment fuse/relay box on the driver’s side, with its exact position shown on the lid’s diagram and labeled as the starter/Anlasser. When in doubt, confirm with the fuse box diagram or the owner’s manual before proceeding with testing or replacement.