Peugeot 508 I Tyre Pressure

Hello and welcome. In this post we look at tyre under-inflation detection on the Peugeot 508 I (2014-present). We cover how the system works, what to do when the warning comes on, what a fault looks like and where the tyre pressure labels are.

Quick Reference

Tyre under-inflation detection

The tyre under-inflation detection system automatically checks the pressures of your tyres while you are driving.

• It continuously monitors the pressures of all four tyres as soon as the car is moving.
• A pressure sensor is located in the valve of each tyre, except the spare wheel.
• It triggers an alert as soon as it detects a drop in pressure in one or more tyres.

The system is a driving aid and does not replace your own vigilance. You still need to check the tyre pressures, including the spare wheel, every month and before a long journey.

Driving with under-inflated tyres worsens road-holding, lengthens braking distances and wears the tyres out early, especially with heavy loads, at high speeds or on long journeys. It also increases fuel consumption.

You will find the correct pressures for your car on the tyre pressure label. Check them when the tyres are cold, which means the car has been stopped for 1 hour or has covered less than 6 miles (10 km) at moderate speeds. Otherwise, add 0.3 bar to the values on the label. The Identification markings section below shows where the label is.

Under-inflation warning

An under-inflation alert is shown by the warning lamp staying on, an audible signal and, depending on equipment, a message on the screen. If only one tyre is affected, a symbol or message may show you which one, depending on equipment.

1. Slow down: reduce your speed straight away and avoid sharp steering movements and sudden braking.
2. Stop: pull over as soon as traffic conditions allow.
3. Check the pressures: if you have a compressor, such as the one in the temporary puncture repair kit, check all four tyres when they are cold. If you cannot do this straight away, drive carefully at reduced speed.
4. Deal with a puncture: if a tyre is punctured, use the temporary puncture repair kit or the spare wheel, depending on equipment.

A tyre that has lost pressure does not always bulge visibly, so do not rely on just looking at it. The alert stays on until the tyre is re-inflated, repaired or replaced. The spare wheel, whether a space-saver or a steel rim, does not have a sensor.

Operating fault

If the under-inflation warning lamp flashes and then stays on, together with the service warning lamp, there is a fault with the system. Your tyre pressures are no longer being monitored.

You will also see this alert when one or more wheels has no sensor, for example when a space-saver or steel spare wheel is fitted.

• Go to a PEUGEOT dealer or a qualified workshop to have the system checked, or to have your original wheel with its sensor refitted after a puncture repair.
• Any tyre repair or replacement on a wheel fitted with this system must be done by a PEUGEOT dealer or a qualified workshop.
• If your car does not detect a wheel after a tyre change, for example after fitting snow tyres, have the system reinitialised by a PEUGEOT dealer or a qualified workshop.

Identification markings

Your 508 carries several markings that identify the car and give you key details, including the tyre pressures.

The manufacturer's label shows:

• the name of the manufacturer
• the European Whole Vehicle Type Approval number
• the vehicle identification number (VIN)
• the gross vehicle weight (GVW)
• the maximum authorised vehicle + trailer weight (the Gross Train Weight or GTW)
• the maximum weight on the front axle
• the maximum weight on the rear axle

The tyre / paint label shows:

• the tyre inflation pressures with and without load
• the tyre specification: dimensions, type, and load and speed indices
• the spare tyre pressure
• the 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 affect the inflation pressures.

Checking tyre pressures: check them when cold, at least once a month. The pressures on the label are for cold tyres. If you have driven for more than 10 minutes, or more than 6 miles (10 kilometres) at more than 30 mph (50 km/h), the tyres will be warm, so add 0.3 bar (30 kPa) to the pressures on the label. Never reduce the pressure of a warm tyre. Low tyre pressures also increase fuel consumption.

Frequently Asked Questions

What should I do when the tyre pressure warning light comes on in my Peugeot 508?

Reduce speed straight away, avoid sharp steering and sudden braking, and stop as soon as traffic allows. Then check all four tyres when cold with a compressor, or use the puncture repair kit or spare wheel if a tyre is punctured.

Why is the tyre pressure light flashing and then staying on?

If it flashes then stays on with the service warning lamp, the system has a fault and your tyre pressures are no longer monitored. It also happens when a wheel without a sensor, such as the spare, is fitted, so see a PEUGEOT dealer or a qualified workshop.

Where is the tyre pressure label on a Peugeot 508?

The tyre / paint label is on the centre pillar on the driver's side. It gives the pressures with and without load, the tyre specification and the spare tyre pressure.

How much pressure should I add if my tyres are warm?

Add 0.3 bar (30 kPa) to the pressures on the label if the tyres are warm. Never reduce the pressure of a warm tyre.

The under-inflation detection system on your Peugeot 508 is a useful extra pair of eyes, but it works best alongside your own monthly checks. Keep your tyres at the pressures on the label, and you will get better grip, shorter braking distances and longer-lasting tyres.

More Peugeot 508 Guides

To understand the other lamps on your dashboard, see our guides to Peugeot 508 orange warning lights, Peugeot 508 red warning lights and Peugeot 508 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 508 model guides.

Cover adapted from a photograph by Navigator84 — Wikimedia Commons, CC BY-SA 4.0 (AI edited).