Reset the Tyre Pressure Monitor (TPMS)

If the tyre-pressure warning has come on in your DS 9 (2021–present) after you’ve adjusted the pressures or changed a wheel, you reset it from the touchscreen. The DS 9 uses sensors in the wheels, so it re-initialises the stored pressures when you confirm in the menu. Seeing the amber symbol after a top-up, a cold night, or a seasonal swap is normal — the car simply needs to re-learn the corrected pressures, and it is not a sign that something has failed.

How the DS 9 Monitors Its Tyres

The DS 9 runs a direct system: each wheel carries its own sensor that reports the actual pressure, so the car can flag a specific soft tyre rather than just a general drop. When you set new pressures and choose the initialisation option, you are telling the system those corrected values are the new “correct” reference. Because the sensors read real pressure, an under-inflated tyre — or a sensor with a flat battery — will keep the warning up until it is put right.

When to Reset

• After checking or adjusting the tyre pressures.
• After changing wheels or tyres, or fitting winter wheels.

First, a Few Checks

• Check pressures cold — stood a few hours or driven under a mile; warm tyres read high.
• Use the placard figures in the driver’s door shut; fronts and rears may differ, and the laden figure is higher.
• Set all four corners before you open the menu, including the one that raised the warning.
• Switch the ignition on and wake the touchscreen so the settings menu is available.
• Confirm the initialisation rather than backing out — the reset only takes if you select YES.

Resetting the System

1. Park level and set all four tyres to the correct cold pressures (placard in the driver’s door shut).
2. Switch the ignition on.
3. On the touchscreen, open the ‘Vehicle setting’ menu.
4. Press ‘Under-inflation initialisation’, then select YES.
5. A confirmation message appears — the system is reset.

If the Warning Stays On

• Recheck every tyre — one below spec keeps the warning on.
• Confirm the initialisation in the menu — backing out leaves it unchanged.
• Drive a few minutes so the sensors report.
• Check the spare or space-saver if fitted; a temporary wheel at low pressure counts as a soft corner.
• Cold snap? Pressure falls roughly 1 PSI per 10 °C, so re-inflate to the placard figure and re-initialise.
• Same corner returning after each reset suggests a slow puncture — have that tyre checked.
• Still showing with correct pressures? A sensor may have a flat battery — look up the code on autodtcs.com.

Once It’s Done

Once you confirm the initialisation and the sensors have reported, the amber warning clears — often within a few minutes of driving. It then stays off for the trip and beyond, as long as the tyres hold pressure. If it returns days later, treat that as a genuine reading and recheck the tyres rather than simply re-initialising over a slow leak.

Frequently Asked Questions

How do I reset the tyre pressure light on a DS 9?

Set the pressures, then on the touchscreen go Vehicle setting > Under-inflation initialisation > YES.

Does the DS 9 have sensors in the wheels?

Yes — it’s a direct system, so a sensor with a flat battery can keep the warning on.

Why won’t the warning clear?

Usually a tyre still below spec, or the initialisation wasn’t confirmed.

Do I need a tool?

No for a normal reset; a tool is only needed if a sensor is replaced.

Why does the light appear on cold mornings?

Air contracts as it cools, so pressures read lower overnight and a borderline tyre can slip under the threshold. Top up to the placard figure while the tyres are cold, then re-initialise from the touchscreen and the warning should clear.

Do I need to re-initialise after fitting winter wheels?

Yes — set the winter tyres to their correct cold pressures, then run Under-inflation initialisation again so the new wheels become the stored reference. Repeat the step when you switch back to the summer set.

If the warning came on with other lights, decode the code on autodtcs.com.