How do you test the TPMS sensor on a Toyota?

To test the Tire Pressure Monitoring System (TPMS) sensor on a Toyota, you'll need to follow a specific process. The TPMS sensor is responsible for monitoring the air pressure in each of your vehicle's tires and alerting you when the pressure drops below a certain level. Properly testing the TPMS sensor is important to ensure it's functioning correctly and keeping you informed of any tire pressure issues.

Steps to Test the TPMS Sensor

1. Locate the TPMS sensor. The sensor is typically located inside the tire, near the valve stem.


2. Use a TPMS sensor tool or diagnostic scanner to activate the sensor. This will cause the sensor to transmit a signal that you can then detect.


3. Check the TPMS warning light on your dashboard. If the light illuminates after activating the sensor, it indicates the TPMS system is working correctly.


4. Verify the sensor's signal strength by checking the sensor's ID number and tire pressure reading on the diagnostic tool or scanner.


5. If the TPMS warning light does not illuminate or the sensor's signal is weak, there may be an issue with the TPMS sensor or the system itself, and further diagnosis may be required.

By following these steps, you can effectively test the TPMS sensor on your Toyota and ensure it's functioning as intended to keep you informed of your tire pressure levels.

Importance of TPMS Sensor Testing

Regularly testing the TPMS sensor is crucial for maintaining the safety and performance of your Toyota. Properly inflated tires can improve fuel efficiency, handling, and tire wear, while underinflated tires can lead to decreased performance, increased wear, and even blowouts. By ensuring your TPMS sensor is working correctly, you can stay informed of any tire pressure issues and address them promptly to keep your vehicle running safely and efficiently.

How do you reset the TPMS sensor on a Toyota?

To reset a Toyota tire pressure sensor, first ensure all tires are properly inflated to the pressure listed on the driver's side door jamb. Then, turn the ignition to the "on" position (without starting the engine) and press and hold the TPMS reset button until the light flashes three times. The button is typically located under the steering wheel or in the glove compartment. If your Toyota has a display audio system, you may need to use the on-screen menus to find the TPMS calibration option.
 
This video demonstrates how to reset the TPMS light on a Toyota Highlander: 45sMetaloop DIY - Cars and ToolsYouTube · Jan 6, 2025
Step-by-step guide

1. Inflate tires: Check your owner's manual or the sticker on the driver's side door jamb for the correct tire pressure. Inflate all tires to the recommended pounds per square inch (PSI). 
2. Locate the reset button: Find the TPMS reset button. It's often a small, circular button labeled with a tire icon, and can be found in a few places depending on your model: 
   • Under the dashboard, near the driver's side kick panel 
   • In the glove compartment 
3. Turn the ignition on: Insert the key and turn it to the "on" position without starting the engine. For push-button start, press the start button once or twice without your foot on the brake. The TPMS warning light should be illuminated on the dashboard. 
4. Press and hold the reset button: Press and hold the TPMS reset button. Continue to hold it until the TPMS light on the dashboard flashes three times. 
5. Drive the vehicle: Turn the engine on and drive for at least 15-20 minutes. The system will re-calibrate, and the light should turn off. 
6. Use the display audio system (if applicable): Some newer Toyotas do not have a physical reset button and require you to use the touch screen: 
   • Press the "Home" button, then navigate to "Settings". 
   • Select "Vehicle," then find and select "TPWS" or "Tire Pressure Warning System". 
   • Choose the "Set" or "Calibrate" option and press and hold the button until the system confirms the reset. 

If the light stays on
If the TPMS light remains on after following these steps, there may be a puncture or a faulty sensor. You should have the tires inspected by a professional.

How do you know if your TPMS sensor is bad?

Signs You Might Need To Replace Your TPMS Sensor

• Dead Batteries. The TPMS sensor relies on your car battery in order to work properly.
• Alerts Must Be Wrong. TPS sensors might provide misleading information if they are malfunctioning.
• Increased Fuel Consumption.
• Handling Concerns.
• Shoddy Tire Change.

Is there a way to test TPMS sensors?

Yes, TPMS sensors can be tested using a dedicated TPMS scan tool to check for functionality and sensor ID, or by using a professional diagnostic tool to read fault codes. A flashing dashboard light often indicates a system failure, and a solid light means there might be an issue with a tire's pressure. 
Using a TPMS scan tool

• Turn on the tool and select the vehicle's make, model, and year. 
• Trigger the sensor by pointing the tool at the valve stem. A successful test will display the sensor's ID and status. 
• If the tool shows "no sensor detected," it indicates a malfunction or an incorrect vehicle selection. 
• A professional or dedicated TPMS scan tool can also be used to check for fault codes, which can help pinpoint a bad sensor. 

Using a basic diagnostic tool

• A basic OBD2 scanner may be able to read TPMS data and identify a problematic sensor.
• If the scanner can't read the sensor, it could be a sign of a bad sensor battery or a faulty sensor itself. 

Initial checks

• Visually inspect the sensors for any signs of damage like cracks or bends in the stem. 
• If the TPMS light is solid, check your tire pressure with a gauge and inflate to the recommended PSI. If the light is flashing, it usually signifies a system failure, often due to a bad sensor. 

How do I know if my Toyota TPMS sensor is bad?

You can tell your Toyota TPMS sensor is bad if the dashboard light is on or flashing even with properly inflated tires, if you experience fluctuating pressure readings, or if the light comes on and stays on after getting new tires. A solid light generally means low tire pressure, while a blinking light or one that stays on after a reset can indicate a sensor malfunction or a dead battery. 
This video explains the symptoms of a bad TPMS sensor and how to check them: 42sMechanical SpecialYouTube · Oct 23, 2024
Common signs of a bad TPMS sensor
This video demonstrates how to check for a bad TPMS sensor: 1mHVAC Mechanic YouTube · Mar 10, 2025

• TPMS light is on or flashing: This is the most obvious sign. A solid light usually means a tire needs air, but if the light is blinking for about a minute at startup, it indicates a sensor problem or communication issue. 
• Light stays on after adding air: If you've checked and corrected the pressure in all tires, but the light remains on (especially after a reset), a sensor is likely faulty. 
• Inconsistent or fluctuating readings: Your tire pressure gauge on the dashboard might show erratic jumps between different readings, which can point to a sensor that is failing. 
• TPMS warning after new tires: A new warning light that appears right after having tires installed or rotated can signal that a sensor was damaged or improperly reset during the service. 
• Increased fuel consumption: Underinflated tires increase a vehicle's rolling resistance, forcing the engine to work harder, which can lead to decreased fuel economy. 
• Noticeable handling changes: While the TPMS light is designed to warn you, a failing sensor might not trigger the light soon enough, and you may notice handling changes like a pulling sensation or a tire that feels flat. 

This video explains the difference between a solid and blinking TPMS light: 57sDrew's GarageYouTube · Oct 28, 2024
What to do next

1. Check tire pressure: The first step is to manually check and adjust the pressure in all four tires to the recommended PSI. Check your vehicle's door jamb or owner's manual for the correct pressure. 
2. Reset the TPMS: After adding air, you may need to reset the system. The reset button is often located under the steering column, but your owner's manual will have specific instructions. 
3. If the light persists: If the light remains on after checking and resetting, a sensor is likely bad. A mechanic can use a specialized TPMS scan tool to diagnose the specific sensor that is failing. 
4. Consider sensor age: TPMS sensor batteries can last for 8–10 years. If your car is this age or older, it may be more cost-effective to replace all sensors at once rather than one at a time.