Peugeot 408 Fuse Box and Fuses (2022-2026)
Hello and welcome. In this article we look at the fuses on the Peugeot 408 I (2022-2026). We will cover who should change a fuse and what to know before adding extra electrical equipment to the car.
Peugeot 408 I Tyre Pressure
Peugeot 408 I (2022-2026) tyre under-inflation detection: how it works, what to do when the alert comes on, reinitialising it and finding tyre pressures.
Hello and welcome. In this article we look at the tyre under-inflation detection system on the Peugeot 408 I (2022-2026): how it works, what to do when the alert comes on, how to reinitialise it and where to find the correct tyre pressures. Some items depend on your car's version or equipment.
Quick Reference
Scroll the table sideways.
| Section | In short |
|---|---|
| Tyre under-inflation detection | How the system works and checking pressures |
| Under-inflation alert | Warning lamp on: slow down and check tyres |
| Reinitialisation | Reset the system after adjusting pressures or wheels |
| Malfunction | Monitoring stops, have the system checked |
| Identification markings | Where to find the VIN and tyre label |
Tyre under-inflation detection
The tyre under-inflation detection system alerts you if one or more tyres lose pressure. It only raises the alert while the car is moving, not when it is stationary.
The system compares information from the wheel speed sensors with reference values. These reference values must be reinitialised every time you adjust the tyre pressures or change a wheel. The system uses the last values stored during reinitialisation, so the tyre pressures must be correct when you do it. Reinitialising is your responsibility as the driver.
The system can never replace your own vigilance. You still need to check the tyre pressures regularly, including the spare wheel, especially before a long journey. Driving with under-inflated tyres, particularly with a heavy load, at high speed or on a long journey:
- worsens road-holding.
- lengthens braking distances.
- causes premature wear of the tyres.
- increases energy consumption.
You will find the inflation pressures for your car on the tyre pressure label. Check the pressures monthly when the tyres are "cold", meaning the car has been stopped for 1 hour or has done a journey of less than 6 miles (10 km) at moderate speeds. If the tyres are not cold, add 0.3 bar to the pressures shown on the label.
You do not need to reinitialise the system after fitting or removing snow chains.
Under-inflation alert
An under-inflation alert is shown by the warning lamp staying on, together with an audible signal and, depending on equipment, a message.
- Slow down: reduce speed immediately, avoid excessive steering movements and avoid sudden braking.
- Stop safely: stop the car as soon as it is safe to do so.
- Check all four tyres: using a compressor, such as the one in the temporary puncture repair kit, check the pressures of all four tyres when cold.
- If you cannot check straight away: drive carefully at reduced speed.
- If you have a puncture: use the temporary puncture repair kit or the spare wheel, depending on equipment.
A loss of pressure does not always show as a visible deformation of the tyre, so do not rely on just looking at it. Driving too slowly may not give the best monitoring. The alert is not triggered immediately after a sudden loss of pressure or a tyre blow-out, because analysing the wheel speed sensor values can take several minutes. The alert may also be delayed below 25 mph (40 km/h) or if you drive dynamically.
The alert stays active until you reinitialise the system.
Reinitialisation
You must reinitialise the system after adjusting the pressure of one or more tyres, and after changing one or more wheels.
Before you start, check the pressures of all four tyres. They must suit the conditions you use the car in and match the values on the tyre pressure label. The system will not tell you if a pressure is wrong when you reinitialise it.
- Stop the car: the car must be stationary.
- Open the menu: go to the Settings>Vehicle touch screen application.
- Find the setting: select Safety > Tire Pressure Setup.
- Confirm: press YES.
A message and an audible signal confirm that the reinitialisation is complete.
Malfunction
If the system has a malfunction, the warning lamps light up on the instrument panel and a message appears with an audible signal. Tyre under-inflation monitoring is then no longer carried out, so have the system checked by a PEUGEOT dealer or a qualified workshop.
Using a non-standard or 'space-saver' spare wheel can suspend tyre pressure monitoring. In this case, the malfunction warning lamp comes on. It goes off once you have replaced that wheel with one the same size as the others, readjusted the pressure and reinitialised the system.
Identification markings
Your 408 carries several visible markings for identifying the car.
Scroll the table sideways.
| Marking | Item | Location |
|---|---|---|
| A | Vehicle Identification Number (VIN) | Under the bonnet, stamped on the chassis |
| B | Vehicle Identification Number (VIN) | On the dashboard, on an adhesive label visible through the windscreen |
| C | Manufacturer's label | On the right-hand door |
| D | Tyres/paint code label | On the driver's door |
The manufacturer's label (C) shows:
- Manufacturer's name.
- European whole vehicle type approval number.
- Vehicle Identification Number (VIN).
- Gross vehicle weight (GVW).
- Gross train weight (GTW).
- Maximum weight on the front axle.
- Maximum weight on the rear axle.
The tyres/paint code label (D) shows:
- Tyre pressures, unladen and laden.
- Tyre specification: dimensions, type, and load and speed indices.
- Spare tyre inflation pressure.
- Paint colour code.
Your car may have been fitted from new with tyres that have higher load and speed indices than those on the label. This does not change the tyre pressures (on cold tyres). If you change the type of tyres, contact a PEUGEOT dealer for the tyre fits approved for your car.
Frequently Asked Questions
Where can I find the tyre pressures for my Peugeot 408?
The pressures are on the tyres/paint code label on the driver's door. It shows unladen and laden pressures and the spare tyre inflation pressure.
How do I reset the tyre pressure warning on a Peugeot 408?
With the car stationary, go to Settings>Vehicle on the touch screen, select Safety > Tire Pressure Setup and press YES. Check that all four tyre pressures are correct first.
Why does the tyre pressure warning stay on after I pumped up my tyres?
The alert stays active until you reinitialise the system. You must reinitialise it every time you adjust the tyre pressures.
Do I need to reset the tyre pressure system after fitting snow chains?
No. The system does not have to be reinitialised after fitting or removing snow chains.
The under-inflation detection system is a useful backup, but it does not replace regular checks. Check your 408's tyre pressures monthly when cold, reinitialise the system after every adjustment or wheel change, and you will keep the monitoring accurate.
More Peugeot 408 Guides
For more on the lamps you may see on your instrument panel, read our guides to the Peugeot 408 orange warning lights, the Peugeot 408 red warning lights and the Peugeot 408 green and blue indicator lamps.
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This is an independent guide, not an official Peugeot publication. Check your vehicle’s own manual before carrying out any work.
Related guides: Peugeot 408 model guides.
Cover adapted from a photograph by A.BourgeoisP — Wikimedia Commons, CC BY-SA 4.0 (AI edited).
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