2017-2024 Audi S4 Auto Start Stop Eliminator | Plug & Play

If your Audi S4 turns start-stop system back on every time you start it, this plug-and-play memory harness solves that one problem: it remembers the last setting and restores it at the next ignition cycle. Coverage is the 2017–2024 Audi S4. It plugs in line with the factory connector named in the instructions, using factory-style plugs on both ends, so nothing is cut or spliced.

It does not delete the feature. Turning stop-start back on is the same button press as before, and the module will remember that too. Removing it returns the vehicle to its original default.

Which Audi S4 models it fits

The fitment table for this SKU lists the following, each marked as a 100% fitment match:

• Audi S4: 2017–2024

For reference, the Audi S4 in these years is a compact performance sedan offered with 3.0L turbo V6 engines. Trim is not listed separately. Any trim in these years with factory stop-start and the pictured connector is covered.

Why the button resets

The factory logic arms start-stop system every time the engine starts. Turning it off with the button only lasts until the engine is shut down. Owners who sit in stop-and-go traffic, tow, or idle in drive-throughs often prefer it off, and that is where the repeated button press comes from.

Keep the battery healthy

The module draws its power from the vehicle and does not change charging behavior. If your Audi S4 sits for long periods, the same rules apply as without it: a maintainer helps, and a battery that tests weak should be replaced with the type specified for stop-start vehicles (usually AGM or EFB).

Why owners turn it off

Pressing the same button on every drive is what wears on owners. People who tow, plow, idle in pickup lines, creep through heavy traffic or simply want the engine running at a light end up making the same press dozens of times a week. On the Audi S4, the module turns that into a one-time choice you can still change whenever you want.

When the engine will not auto-stop anyway

A Audi S4 that rarely auto-stops is often telling you something about the battery. Stop-start vehicles usually run an AGM or EFB battery, and the system is one of the first features to drop out as that battery ages. Cabin temperature requests, engine temperature and brake pressure also factor in. None of these checks are altered by the module.

Where it connects

It plugs in line with the factory connector named in the instructions, using factory-style plugs on both ends, so nothing is cut or spliced. The instructions show the connector for this application; compare it with the product photos before starting. Turn the vehicle off, make the connection, fix the module in place, and test with two or three key cycles.

What changes after installation

• It does not change engine power, transmission shifts, emissions calibration or fuel trims.
• It does not write anything to the vehicle's modules, and removing it restores the stock default.
• It remembers the last stop-start setting through a key cycle.
• It leaves the factory button working, so you can turn stop-start back on whenever you want.

Diagnostics first

If the setting is not remembered, check that the module was installed with the ignition off and that the connector clicked into place. Then press the factory button once, switch the vehicle off, close the doors, give the electronics time to shut down, and start again. If it still resets, contact support with the year, trim and a photo of the connector.

Confirm these points

• Model year and model match a row in the table above (2017–2024 Audi S4).
• Your Audi S4 has the factory stop-start button. Base trims or engines without stop-start have nothing for the module to remember.
• No aftermarket remote start, alarm or gateway bypass is wired into the same circuit. If one is, email support before ordering.
• The battery and charging system test good and no warning lights are on.
• The connector at your install point matches the one in the product photos.
• If you are unsure, send your VIN to support@automotivebypass.com and we will confirm fitment.

Ordering details

Shipping is free to the contiguous US. Orders leave in 1–2 business days and usually arrive 3–4 business days later. Returns are accepted within 45 days with pre-approval; a 20% restocking fee applies and the buyer covers return shipping. The part carries a 3-year limited warranty, and support@automotivebypass.com answers Monday to Friday, 9–5 Pacific.