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Under-inflation
Peugeot under-inflation warning in car: low tyre pressure
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
A fixed under-inflation lamp means one or more tyres have lost pressure. Reduce speed, avoid sudden braking and steering, stop as soon as it is safe and check all four tyres cold before reinitialising the system.
Safety first
Stop and check this first
- Driving on under-inflated tyres worsens road holding, lengthens braking distances and wears the tyres, with a risk of accident according to Peugeot. The alert may be delayed below 40 km/h and is not immediate after a blow-out or sudden pressure loss.
- Under-inflation detection does not replace a monthly tyre pressure check, including the spare wheel, or your vigilance at the wheel.
Safe checks you can perform
- Reduce speed and stop safely
- Measure cold and compare with the label
- Reinitialise the detection
Leave these tasks to a qualified professional
- Do not attempt this professional task: Inspection of the tyre losing pressure
- Do not attempt this professional task: Detection system diagnosis
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Inspection of the tyre losing pressure
What they doThe workshop examines the punctured or leaking tyre and tells you whether it can be repaired or must be replaced, as Peugeot recommends after a puncture.
They must show youthe leak point or damage found and the pressures measured cold.
In writingmeasured and final pressures, whether the tyre was repaired or replaced and that detection was reinitialised.
Detection system diagnosis
What they doIf the lamp flashes then stays on with the Service lamp, the workshop reads the fault memory and checks the signals the system uses.
They must show youthe fault memory readout (stored and pending codes) and the wheel speed sensor signals.
In writingthe codes, the part checked or replaced and whether codes were cleared before or after the repair.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Reduce speed and stop safely
- Who:
- you, at the wheel.
- How:
- reduce speed immediately, avoid excessive steering movements and sudden braking and stop as soon as it is safe to do so. Do not rely on a visual check: the pressure loss is not always visible.
- Result that matters:
- stopping safely before the tyre is damaged further.
- If there is a puncture:
- use the temporary puncture repair kit or the spare wheel, depending on equipment.
- If you cannot check the pressure right away:
- drive carefully at reduced speed until you can.
- Evidence to keep:
- photo of the lamp or message and of the suspect tyre.
Evidence: Handbook Peugeot 208 edition 01-20 (en-GB)
Measure cold and compare with the label
- Who:
- you, with a gauge or the repair kit compressor.
- How:
- check all four tyres cold (car stopped for 1 hour or after less than 10 km at moderate speed) and compare with the label on the driver's door aperture. If you have driven more than 10 minutes or more than 10 km above 50 km/h, add 0.3 bar to the label values.
- Result that matters:
- all four pressures matching the label for your load.
- If one tyre keeps losing pressure:
- it may be punctured, have the tyre examined.
- If all are correct:
- reinitialise the system and watch whether the lamp returns.
- Evidence to keep:
- note of each measured pressure and the final ones.
Do it parked off the carriageway. The kit compressor plugs into the 12 V socket with the ignition on; remove the valve cap and keep it somewhere clean.
Evidence: Handbook Peugeot 208 edition 01-20 (en-GB)
Reinitialise the detection
- Who:
- you, with the car stationary.
- How:
- with all four tyre pressures correct, reinitialise via the Driving/Vehicle touch screen menu. Always do it after adjusting pressures or changing wheels. The system does not warn if a pressure is wrong at the time of reinitialisation. Snow chains do not require reinitialising.
- Result that matters:
- the system storing new, correct reference values.
- If the lamp goes off and stays off:
- it was a pressure warning.
- If the lamp flashes then stays on with the Service lamp:
- detection is faulty, go to a Peugeot dealer or a qualified workshop.
- Evidence to keep:
- photo of the instrument panel after reinitialising.
Evidence: Handbook Peugeot 208 edition 01-20 (en-GB)
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Vehicles
- Brand
- Peugeot
- Product type
- Cars
Known code variants
- Alerta de inflado insuficiente
- Detección de desinflado de ruedas
- Inflado insuficiente
- Peugeot 208 testigo neumático
- Peugeot 208 tyre pressure light
- Peugeot reinicializar presión neumáticos
- Peugeot reset tyre pressure
- Peugeot tyre pressure warning
- Testigo de inflado insuficiente
- testigo presión neumáticos Peugeot
- Tyre under-inflation detection
- Under-inflation
- Under-inflation alert
- Under-inflation warning lamp
What it means
In the Peugeot 208 handbook (edition 01-20), the 'Under-inflation' lamp fixed, with an audible signal and depending on equipment a message, means the pressure in one or more tyres is too low. The system does not measure pressure: it compares wheel speed sensor data with reference values stored at the last reinitialisation. If the lamp flashes then stays fixed with the Service lamp, the detection system is faulty. Other models may use another system. The lamp alone does not prove that a part is faulty.
Warnings and stop conditions
- Highsource verified
Driving on under-inflated tyres worsens road holding, lengthens braking distances and wears the tyres, with a risk of accident according to Peugeot. The alert may be delayed below 40 km/h and is not immediate after a blow-out or sudden pressure loss.
Evidence: Handbook Peugeot 208 edition 01-20 (en-GB)
- Mediumsource verified
Under-inflation detection does not replace a monthly tyre pressure check, including the spare wheel, or your vigilance at the wheel.
Evidence: Handbook Peugeot 208 edition 01-20 (en-GB)
Symptoms and causes
Probable causes · in order
- Pressure loss or punctureCommon
One or more tyres have lost pressure; Peugeot warns that the loss does not always cause visible deformation of the tyre.
Evidence: Handbook Peugeot 208 edition 01-20 (en-GB)
- System not reinitialisedPossible
The alert stays active until the system is reinitialised, even after the pressure is corrected; reinitialising is also needed after changing a wheel.
Evidence: Handbook Peugeot 208 edition 01-20 (en-GB)
- Non-standard or space-saver spare wheelPossible
A spare wheel of a different size may suspend monitoring and light the malfunction lamp until a wheel of uniform size is refitted.
Evidence: Handbook Peugeot 208 edition 01-20 (en-GB)
- Detection system faultLess common
With the lamp flashing then fixed together with the Service lamp, the system is faulty and under-inflation is no longer monitored.
Evidence: Handbook Peugeot 208 edition 01-20 (en-GB)
Virtual technician
Does Under-inflation still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Handbook Peugeot 208 edition 01-20 (en-GB)
Peugeot (Stellantis) · 2020 · manual
- 2
Guía de utilización Peugeot 208 edición 01-20 (es-ES)
Peugeot (Stellantis) · 2020 · manual
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