These instructions apply to the Lexus LS Mk5 (GVF50) 2018-Present.
For other models, please choose your vehicle here.
When the tyre-pressure warning lights up on the dash of your Lexus LS (2018–present), it is usually the car doing exactly what it is meant to do: telling you a tyre has drifted away from the pressure it expects. Most of the time this happens after you have topped the tyres up, rotated the wheels, or fitted a winter set — the reference the car was holding no longer matches what is in the tyres, so it flags a difference. It is a housekeeping message, not a sign of a fault, and on the LS you clear it by teaching the system the new pressures with the TPMS SET button. Here is how to do it properly.
How the LS Tyre-Pressure Monitor Works
The LS uses a direct system: there is a small pressure sensor inside each wheel that reports what the tyre is actually holding. Because the car does not know the exact figure you intend to run, it works from a stored reference. When you press SET, it takes whatever the four tyres currently read and saves that as the new correct baseline — which is exactly why you must inflate the tyres properly before you store, not after. Store the wrong pressures and the warning simply goes quiet at the wrong target.
Before You Begin
- Check the tyres cold — parked for a couple of hours or driven less than a mile. Warm tyres read high and will set the baseline wrong.
- Use the figure on the driver’s door-pillar label. It lists the front and rear pressures, and often a separate higher figure for a full car or motorway loads.
- Set all four corners — don’t forget the one that triggered the warning.
- Park on level ground with the car stationary before you press SET.
- Do this after adjusting pressures, changing or rotating wheels, or fitting a winter set — any of those move the reference.
Resetting the System
- Park level and set all four tyres to the correct cold pressures (placard in the driver’s door shut).
- Switch the ignition on (you don’t need to start the engine/hybrid system).
- Press and hold the TPMS ‘SET’ button (low on the dash near the steering column) until the TPMS warning light blinks (typically three times), then release.
- The system learns the current pressures as the new baseline; it finishes after a short drive.
If the Warning Stays On
- Recheck every tyre with a known-good gauge — one corner a few psi low keeps the warning on and can block the reset.
- Hold the SET button until the light blinks — releasing too early cancels the learn, so nothing is stored.
- Drive for a few minutes after pressing SET so each sensor wakes and reports its reading.
- If you fitted a space-saver or full-size spare that has no sensor, the car may flag until the normal wheel is back on.
- A cold overnight drop can trip the light in the morning; top the tyres back up to the label figure and re-store.
- Watch for a slow puncture — if one corner keeps falling within a day or two, the reset is not the problem, the tyre is.
- Still lit with everything correct? A sensor battery may be flat. Those are sealed and are usually replaced when a tyre is next off the rim — if a code is stored, look it up on autodtcs.com.
After the Reset
Once the SET has taken and you have driven a short distance, the TPMS light should go out and stay out for the rest of the trip. From then on the car watches against the pressures you just stored, so it will only warn again if a tyre genuinely drops. It is worth re-checking the tyres cold after a day to confirm nothing is leaking — a warning that clears then returns within hours points to a puncture rather than a monitor that needs resetting.
Frequently Asked Questions
How do I reset the tyre pressure light on a Lexus LS?
Set all four tyres to the correct cold pressures from the door-pillar label, switch the ignition on, then press and hold the TPMS SET button low on the dash until the warning light blinks (typically three times). Release it and drive a short distance to let the sensors report; the light should then go out.
Where is the TPMS SET button?
It sits low on the dashboard near the steering column, within easy reach from the driver’s seat. It is a small dedicated button rather than something buried in the touchscreen. If you cannot spot it, the exact position is shown in your handbook — look for the tyre symbol.
Why won’t the warning clear?
Almost always because one tyre is still below the target, or because the SET button was let go before the light blinked so nothing was stored. Re-gauge all four cold, top up the low corner, then hold SET until the light flashes and drive for a few minutes to complete the learn.
Do I need a diagnostic tool?
No — a normal reset after adjusting pressures or swapping wheels needs only the SET button. A tool is only required if an in-wheel sensor has been replaced and has to be registered to the car, which a tyre shop handles when the sensor is fitted.
Do I have to re-store after fitting winter wheels?
Yes. If the winter set carries its own sensors, inflate them to the label figure and run the SET procedure so the car learns them. If a wheel has no working sensor the system will keep flagging until a matched sensor is present.
The light came back the next cold morning — is something wrong?
Not necessarily. Tyre pressure falls as the air cools, so a chilly night can drop a tyre below the threshold. Top all four back up to the cold label figure, re-store with SET, and it should stay off. If one corner keeps losing pressure day after day, suspect a slow puncture.
If the warning appeared alongside other dashboard lights, decode the stored code on autodtcs.com.
Independent guide — not affiliated with Lexus. Always follow your official service manual and safety precautions. Read our full disclaimer.