These instructions apply to the Lexus CT Mk1 (ZWA10) 2011-2022.
For other models, please choose your vehicle here.
If the tyre-pressure warning has come on in your Lexus CT 200h (2011–2022) after you’ve adjusted the pressures or changed a wheel, you reset the monitor with the car’s TPMS SET button. Here’s how.
On the ZWA10 CT 200h, the tyre-pressure warning is an amber horseshoe symbol with an exclamation mark inside it. When it lights it does not mean the car is broken — it means the monitor has seen at least one tyre reading below the pressure it has stored. That happens perfectly normally after a cold night, after a fast motorway run cools back down, or once you’ve had a wheel off. Putting the right air back in is only half the job; the light stays on until you store the corrected pressures as the new baseline, which is what the SET button is for.
How TPMS works on this car
The CT uses a direct system: each wheel carries its own battery-powered sensor that measures the real pressure and transmits it to the car. Because the data comes from inside the wheels rather than being estimated from wheel speed, the system can tell a soft tyre from a correctly inflated one — but it also means every sensor must be seen and registered when you reset. The SET store simply records whatever pressures are in the tyres at that moment as the reference, so those pressures need to be right before you begin.
Before You Begin
- Check the tyres cold — stood for a couple of hours, or driven less than about a mile — because warm tyres read high and skew the baseline.
- Set all four to the figure on the driver’s door-pillar placard (open the driver’s door to read it); use the laden figure if the car is fully loaded.
- Include the spare if it has a sensor fitted.
- For the reset you only need the ignition on — you don’t have to start the hybrid system.
- Use an accurate gauge; forecourt lines can read a few psi out.
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 hybrid system).
- Press and hold the TPMS ‘SET’ button (usually low on the dash, near the steering column) until the TPMS warning light blinks (typically three times), then release.
- The system now learns the current pressures as the new baseline; it finishes after a short drive.
If the Warning Stays On
- Recheck every tyre — one corner a few psi low keeps the warning on and blocks the reset, and a single soft tyre is easy to overlook.
- Hold the SET button until the light blinks — releasing early cancels the store.
- Drive for a few minutes after pressing SET so the sensors report and the baseline settles.
- After a wheel swap — winter wheels, a rotation, or a repair — you must re-store, because the pressures moved with the tyres.
- Cold weather knocks roughly 1 psi off for every 10 °C the temperature drops, so top up and reset once the tyres are properly cold.
- A slow puncture will trip the light again within a day — check for a nail or a weeping valve if it keeps returning.
- Still showing with correct pressures? A sensor may have a flat battery — look up the code on autodtcs.com.
After the Reset
Once the store completes, the amber symbol goes out and stays out for the rest of the trip, and it should keep the pressures held. The in-wheel sensor batteries last several years but not indefinitely; when one eventually fails the warning comes back and an ordinary reset won’t clear it, which is usually the sign a replacement sensor is due.
Frequently Asked Questions
How do I reset the tyre pressure light on a Lexus CT 200h?
Set the pressures, switch on, then press and hold the TPMS SET button until the warning light blinks.
Where is the TPMS SET button?
Usually low on the dashboard near the steering column, often below the light switches or beside the column — a small button marked with the tyre symbol or “SET”. The exact spot can vary by trim and market, so your handbook shows precisely where it sits.
Why won’t the warning clear?
Usually a tyre still below spec, or the SET button wasn’t held until the light blinked. Recheck all four cold with a good gauge, correct anything low, then hold SET until the light blinks and drive a few minutes so the sensors report the new baseline.
Do I need a tool?
No for a normal reset; a tool is only needed if a sensor is replaced.
Do I need to reset after rotating the tyres?
Yes. Because the system stores pressures corner by corner, any time the wheels move — a rotation, a puncture repair, or a winter-wheel swap — set the pressures cold and run the SET store again so the baseline matches where each wheel now sits.
Can cold weather trigger the light on its own?
Yes. Air contracts as it cools, so tyres set correctly in mild weather can read low on a cold morning and set the warning off with no leak present. Top back up to the placard figure when cold and re-store; if it keeps returning while the tyres are warm, suspect a slow puncture instead.
Does the hybrid system need to be running to reset?
No. Switching the ignition to the on position is enough — you do not need to press the power button to READY or have the engine turning. Store the pressures with the car simply switched on, then drive a few minutes to let the sensors confirm.
If the warning came on with other lights, decode the code on autodtcs.com.
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