These instructions apply to the Peugeot 308 Mk3 (P5) 2021-Present.
For other models, please choose your vehicle here.
The Peugeot 308 Mk3 (P5, 2021–present) learns a reference set of tyre pressures, so after inflating or changing a tyre you re-initialise it from the i-Cockpit menu. When a tyre drops below that stored reference the amber symbol appears in the cluster. It is a maintenance prompt, not a fault — the current pressures simply no longer match what the car last memorised. Here’s how to clear it.
How the System Works on This Model
Many 308s use an indirect monitor: instead of a pressure sensor inside each wheel, it compares how fast each wheel is turning through the ABS wheel-speed sensors. A soft tyre has a slightly smaller rolling radius, so it spins fractionally faster than the others, and the system flags the difference. That is exactly why there is no live per-wheel pressure display to reset and why you re-teach a reference through the menu rather than with a tool. Cars fitted with direct in-wheel sensors follow the same menu initialisation, so the steps below apply either way.
Before You Begin
- Set the pressures when the tyres are cold — before driving, or after the car has stood for a couple of hours.
- Use the figure on the driver’s door-pillar label (or inside the fuel flap) for your wheel size and load.
- Do all four corners, and check the spare if one is carried.
- Park on level ground with the car stationary and the ignition on.
- Only store the reference once every tyre is correct — the car memorises whatever it reads at that moment.
Inflate First
Set all four tyres cold to the door-pillar label figure, then store the new reference.
Resetting via the Menu
- Park the car and switch the ignition on.
- Press ‘MENU’ and open ‘Driving’ (driving assistance).
- Choose ‘Under-inflation initialisation’, then ‘YES’.
- The current pressures are stored as the new reference and the warning clears.
Light Won’t Clear?
- Check every tyre — one odd corner keeps the warning on, and an indirect system only needs a small difference to trigger.
- Re-initialise after any inflation or wheel change so the baseline matches what is actually on the car.
- Look for a slow puncture — if one corner keeps dropping over a day or two, a nail or leaking valve is the likely cause, not the sensor.
- Check the space-saver or full-size spare if you have just fitted it; its different size can upset an indirect system until you re-store.
- Cold snap? Pressure falls roughly 0.1 bar for every 10 °C drop, so a cold morning can wake the light. Top up to spec and re-initialise.
- Give it a short drive after storing so the system can settle against the new reference at road speed.
After the Reset
Once you confirm the initialisation the amber symbol should go out straight away or within the first few minutes of driving. From then on the stored figure is the baseline the car watches, so the warning stays off for the trip and only returns if a tyre genuinely loses pressure again. If it comes back the same day with pressures you know are correct, treat it as a real leak to investigate rather than a glitch.
Frequently Asked Questions
How do I reset the tyre pressure light on a Peugeot 308?
Set every tyre to the door-pillar figure while cold, switch the ignition on, then press MENU, open Driving, choose Under-inflation initialisation and confirm YES. The current pressures are stored as the new reference and the amber light clears within a short drive.
Any tool needed?
No — the 308 stores the reference itself from the menu, so no diagnostic tool or garage visit is required for a normal reset. A tool is only involved if brand-new pressure sensors are being fitted to a car with a direct system, which is a workshop job rather than a routine reset.
Why does it trigger in the cold?
Cold air is denser, so pressure drops as the temperature falls overnight. A tyre set correctly in a warm garage can read low on a frosty morning and wake the warning. Top the tyres back up to the label figure while cold and re-initialise, and the light should stay off.
It lit after a wheel swap — normal?
Yes — re-run the initialisation so the new pressures become the baseline. Rotating tyres or fitting winter wheels changes the rolling radii the system has memorised, so it needs to relearn. Set the pressures first, then store the reference from the menu.
Do I have to re-store after seasonal tyre changes?
Yes, it is good practice. Whenever you swap between summer and winter sets, or move to the spare, set each tyre to the correct cold pressure and run the initialisation again so the car judges against the wheels actually fitted.
Is the light an MOT or safety concern?
A permanently lit TPMS symbol is a test failure in many regions and signals that a tyre needs attention. An under-inflated tyre also wears faster and handles worse, so check and correct the pressures promptly rather than ignoring it.
Stored a fault code? Look it up on autodtcs.com. To clear a service reminder, see our 308 Mk3 service reset.
Independent guide — not affiliated with Peugeot. Always follow your official service manual and safety precautions. Read our full disclaimer.