Reset the Tyre Pressure Monitor (TPMS)

The Audi A4 (B9/8W, 2015–present) stores a reference set of tyre pressures, so after you inflate or change a tyre you tell it the new values are correct. You do that through the MMI menu. A warning after inflation or a wheel swap is expected behaviour, not a fault — the car is just comparing what it now reads against the baseline it last saved, and it clears the moment you save the corrected figures. Here’s how.

How the A4’s System Works

On this generation the monitor works on a stored baseline: you set the pressures, you save them through the MMI, and from then on the car flags a corner that drifts meaningfully below what you saved. Because it references your saved figures rather than a fixed number, the reset only ever works in the right order — inflate first, save second. Save with a soft tyre and the A4 will treat ‘soft’ as correct until you re-store. That is also why simply adding air without re-storing often leaves the light on.

First, a Few Checks

• Check and set pressures cold — first thing, or after the car has stood a few hours. Warm tyres read high and save a false baseline.
• Use the figure on the driver’s door-pillar label for your wheel size, not a generic number.
• If the label gives a separate laden or motorway pressure, choose the one that matches the day’s load.
• Set all four corners — and a full-size spare if it is in use — before you open the menu.
• Switch the ignition on so the MMI is live; you don’t need the engine running to reach the menu.

How to Store the New Pressures

1. Adjust the pressures, then switch the ignition on.
2. On the MMI, open ‘Vehicle’ (or the car/assist menu).
3. Select ‘Service & checks’ → ‘Tyre pressure monitoring’ (wording varies by software).
4. Choose ‘Store tyre pressures’ / ‘SET’ and confirm. A message confirms the new reference is saved.

If the Light Stays On

• Re-check every tyre. The system compares wheels against the saved baseline, so one low corner keeps it lit — use a gauge you trust rather than the dash estimate.
• Always re-store after inflating. Adding air without saving the new figures leaves the old baseline in place, and the warning stays.
• Drive a little after saving. The confirmation may need a short run before the warning fully drops out.
• Store cold. If you saved after a motorway run, the baseline is high and a cold morning will trip it — re-store first thing.
• After a wheel change — winter set, rotation, a repaired tyre — set the pressures exactly and store again.
• A slow puncture will keep returning the warning however often you store; if one corner needs air every few days, have the tyre inspected.
• If everything is correct and it still won’t clear, a sensor or system fault may be logged rather than a low tyre.

Once It’s Done

Once saved, the confirmation message appears and the warning clears — usually straight away, sometimes after a short drive. The stored reference then holds until you next change pressures or wheels, so you don’t have to repeat it each journey. Re-store at every seasonal tyre change, and whenever you deliberately raise the pressures for a fully loaded or long-distance run.

Frequently Asked Questions

How do I reset the tyre pressure light on an Audi A4?

Set the pressures cold to the door-pillar figures, switch the ignition on, then in the MMI go to Vehicle → Service & checks → Tyre pressure monitoring and choose Store tyre pressures. The car saves the new values as its baseline and the warning clears.

Do I need a tool?

No. The A4 stores the reference through its own MMI menu, so no garage equipment or valve-cap relearn tool is needed for a routine reset. A tool is only required if a physical pressure sensor is replaced, which is a workshop task rather than a reset.

Why does the light come on in cold weather?

Pressure falls as temperature drops — roughly 1 psi per 10 °C — so a cold morning can pull one or more corners below the stored baseline with no actual leak. Top the tyres back up to the label figure while they are cold, then re-store the reference.

It came on after a wheel change — why?

You moved the reference. Fitting different wheels, a winter set, or rotating the existing ones changes what the system reads against the saved baseline. Set every corner to the correct pressure and re-run the store so the new values become the baseline.

Where is the tyre-pressure menu on the MMI?

It sits under the Vehicle (car/assist) menu, in Service & checks, as Tyre pressure monitoring. The exact wording shifts a little between software versions, but you are looking for the tyre-pressure entry with a Store or SET option inside it.

Do I have to store all four tyres or just one?

The store saves all four at once, so set every corner correctly before you confirm. There is no single-wheel store — if only the corner you topped up is right and the others are off, those wrong figures get saved as the new baseline.

If a fault code is stored, look it up on autodtcs.com. To clear a service reminder, see our A4 B9 service reset.