Yes, a tyre pressure warning light can fail an MOT in the UK if there is a TPMS fault, damaged sensor, warning light malfunction or unsafe tyre condition affecting road safety.
If the tyre pressure light is on because tyre pressures are low, the first step is to inflate the tyres correctly and reset the system properly.
If the light is on because the TPMS itself has a fault, such as a failed sensor, communication fault or system malfunction, it can fail an MOT on relevant vehicles.
The tester is not diagnosing your tyre pressure system in depth. They are looking at whether the TPMS warning shows a fault and whether the system appears to be working as required.
A steady warning, flashing warning or message such as “TPMS fault” should be checked before the test.
The tyre pressure warning light usually looks like a horseshoe-shaped tyre symbol with an exclamation mark.
This is the common simple cause. Check pressures cold and inflate to the vehicle’s recommended setting.
If one tyre keeps dropping, look for a nail, valve leak, rim leak or tyre damage.
A sensor, valve, battery, receiver or control system fault can keep the warning on.
Many direct TPMS sensors have sealed batteries that weaken with age.
Some vehicles need a manual reset after tyre pressures are corrected.
After tyre or wheel work, sensors may need relearning or the system may need recalibration.
These are the situations where the warning light is more likely to cause MOT problems.
A flashing light, permanent system fault message or sensor error can fail on applicable vehicles.
If pressures are simply low, correct them properly and reset the system before the MOT.
If the warning returns after correct pressures and reset, there may be a puncture or TPMS fault.
One wheel showing no pressure reading can point to a failed sensor or communication fault.
Replacement wheels without sensors can trigger TPMS faults on direct-sensor systems.
If the pressure light is linked to a puncture, bulge, cut or cord damage, the tyre itself may fail.
Correct tyre pressure improves braking, steering response, tyre life and fuel economy. A tyre that is badly under-inflated can overheat, wear quickly and become unsafe.
Over-inflated tyres can also reduce grip and comfort. TPMS is there to warn you before tyre pressure becomes a bigger safety problem.
A tyre pressure light can be the first clue to a puncture, leaking valve, cracked tyre, damaged rim or sidewall problem.
If a tyre keeps losing pressure, do not keep topping it up without finding the cause.
Do these checks before resetting the light or presenting the vehicle for test.
Use the sticker inside the door shut, fuel flap or handbook. Check all four tyres before driving far.
Look for nails, cuts, cracking, uneven wear, low tread, sidewall bulges and exposed cords.
Some vehicles need a manual reset after correcting pressures. Only reset after checking the tyres.
Many systems need a short drive before the warning clears or updates.
Book a tyre or diagnostic inspection before the MOT.
Some vehicles monitor the spare wheel too, especially on certain direct TPMS systems.
These are the faults a garage or tyre fitter would normally check first.
Many TPMS sensors contain sealed batteries that weaken with age.
Can happen during tyre fitting, corrosion or valve impact.
Cold weather naturally lowers tyre pressure and can trigger the warning.
New wheels may need sensors fitted, coded or relearned.
A tyre may lose pressure gradually from a nail, valve leak or rim seal leak.
Less common, but possible on some vehicles with TPMS communication faults.
Yes, but only after the tyre pressures are correct and the tyres have been inspected. Resetting the warning without checking the tyres can hide a slow puncture or unsafe tyre condition.
If the light comes back again after a proper reset, the car needs further checks.
Read the TPMS reset guide →Some vehicles use direct TPMS sensors inside the wheels. Others estimate pressure loss using wheel speed data from the ABS system. That is why reset procedures and faults vary between vehicles.
The important thing is the same: the warning should be resolved properly before the MOT.
Costs depend on whether the problem is tyre pressure, puncture repair, a sensor or a system fault.
Usually very low cost or free if you have a compressor at home.
Often modest cost, depending on tyre condition and puncture location.
Varies by vehicle, sensor type, valve type and programming needs.
Some sensors need valve stems, seals or service parts during tyre fitting.
Some vehicles need a relearn procedure after sensor or wheel replacement.
Needed if pressure loss is caused by sidewall damage, severe wear, cords or bulges.
Always diagnose the cause before replacing multiple sensors unnecessarily.
These are common situations seen before MOT tests and tyre inspections.
Tyres should usually be checked cold for the most accurate setting.
This often means a slow puncture, valve leak or rim seal leak.
Resetting before checking pressures can hide the real issue temporarily.
A sensor may have been damaged, missed, not relearned or already weak.
A borderline tyre may trigger the light when temperatures drop overnight.
Pressure warnings after impact should lead to a proper tyre and wheel inspection.
Common questions about TPMS warnings, low pressure, sensor faults and MOT failure.
Low pressure alone may not be the only issue, but TPMS warnings and tyre condition can matter.
Many vehicles allow a manual reset after pressures are corrected.
Often several years, depending on battery life, mileage, age and sensor type.
Yes. Lower temperatures often reduce tyre pressure enough to trigger warnings.
No. It may indicate unsafe tyre pressure, tyre damage or a system fault.
Yes, if it causes a TPMS malfunction warning on a vehicle where the system is checked.
Yes. A slow puncture is one of the most common reasons one tyre keeps losing pressure.
Check pressures, inspect tyres, reset the system and repair faults before the test.
Motor Vehicle Expert publishes practical UK-focused vehicle diagnostics, maintenance, MOT, warning light, used car and repair cost guidance based on common driver questions and real-world garage situations.
