2021 Lexus ES300h Tire Pressure Warning Light Stays On

Troubleshooting Tire Pressure Warning Light Issues in Your 2021 Lexus ES300h: Causes and Solutions

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Tire Leaking Air
0%
30% chance it's the
Wheel Leaking Air
0%
15% chance it's the
Tire Pressure Monitoring System
0%
15% chance it's
Something else
The most common reasons a 2021 Lexus ES300h tire pressure warning light stays on are a leaking tire, a wheel that no longer holds air, or a faulty tire pressure monitoring system.
  • Tire Leaking Air: A puncture, valve stem issue, or rim damage can cause a tire to leak air, leading to loss of pressure.
  • Wheel Leaking Air: A puncture or damage to the tire or rim can cause air to leak, resulting in a loss of tire pressure.
  • Tire Pressure Monitoring System: A malfunctioning tire pressure monitoring system can be caused by faulty sensors or a dead battery in the sensor units.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2021 Lexus ES300h tire pressure warning light stays on?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

When a tire pressure monitoring sensor fails, the tire pressure monitoring system control module will recognize a loss in communication and turn on the warning lamp which indicates the failure. This is most often the case. However, the tire pressure monitoring sensor may also fail by reporting incorrect tire pressures. This could cause a flat tire to go unrecognized, or a properly inflated tire to signal a low or high tire pressure warning.

When a relearn is needed, for any reason, the TPMS warning light will illuminate, and many vehicles will display a message relating to the TPMS system being inoperative or loosing communication. It is important to keep a watchful eye on tire pressures when this system is having issues because there is no warning available for underinflation or overinflation of the tires.

Wheels offer very few symptoms, but these symptoms should never be ignored. Visible cracks on the wheels may appear, especially after hitting a large bump, Most often, this will also be accompanied by loss of air from the tire on that wheel. Also, vibration in the steering wheel is very common when the tire is out of balance, and improper wheel nuts or bolts can cause creaking and popping noises to develop. Again, there are very few symptoms, but they should not be ignored.

The only symptoms requiring diagnosis for the tire pressure monitoring system warning lamp is if the warning lamp has illuminated while the tires have correct air pressure, or if the air pressure for the tires is out of specification and the warning lamp is off. This is because the overwhelming majority of cases where the TPMS lamp illuminates is due to the change in ambient temperature.

What steps should I take to diagnose the tire pressure warning light issue in my 2021 Lexus ES300h?

To effectively diagnose the tire pressure warning light issue in your 2021 Lexus ES300h, begin with a thorough check of the tire pressure in all four tires using a reliable tire pressure gauge. Ensure that each tire is inflated to the recommended levels specified in your vehicle's manual, as improper inflation is a common cause of warning lights. Next, inspect the tires for any visible damage, such as punctures, cuts, or bulges, which could indicate a more serious problem. If the tires appear to be in good condition and properly inflated, proceed to reset the tire pressure monitoring system following the instructions in your manual, as this can sometimes resolve temporary issues. After resetting, take your vehicle for a short drive; the system may need to recalibrate, and the warning light could turn off on its own. If the light remains illuminated despite these efforts, it is advisable to consult a mechanic or authorized service center to investigate any underlying issues that may require professional attention. By following this diagnostic approach, you can systematically address the tire pressure warning light and ensure your vehicle's safety and performance.

What could cause the tire pressure warning light to remain on in a 2021 Lexus ES300h?

When the tire pressure warning light stays illuminated in your 2021 Lexus ES300h, it’s essential to understand the common problems that could be at play. The most frequent culprit is low tire pressure, which can easily be checked with a tire pressure gauge. Ensure all tires are inflated to the manufacturer’s recommended levels, as even a slight drop can trigger the warning light. If the pressure is adequate, consider the possibility of a faulty tire pressure sensor; these sensors can malfunction over time and may require replacement. Additionally, sensor calibration issues can arise, particularly after tire rotations or replacements, necessitating a recalibration to ensure accurate readings. Electrical faults within the tire pressure monitoring system can also cause persistent warning lights, which may require professional diagnostics. Lastly, be mindful of extreme temperature changes, as they can affect tire pressure and lead to false alerts. By systematically addressing these potential issues, you can effectively troubleshoot the tire pressure warning light in your vehicle.

What immediate steps should be taken if the tire pressure warning light remains on in a 2021 Lexus ES300h?

When the tire pressure warning light remains illuminated in your 2021 Lexus ES300h, it is crucial to act promptly to ensure your safety and the longevity of your vehicle. Ignoring this warning can lead to dangerous driving conditions, including reduced traction and increased risk of tire blowouts, which can result in serious accidents. Start by checking the tire pressure in all four tires with a reliable gauge, ensuring they meet the manufacturer's specifications found in your owner's manual or on the door jamb. If you discover any tires are underinflated, inflate them to the correct levels using an air compressor. Additionally, visually inspect each tire for any signs of damage, such as punctures or bulges, as these can compromise your safety and require immediate attention. Once you have adjusted the tire pressure and addressed any visible issues, reset the tire pressure monitoring system according to the instructions in your owner's manual. If the warning light persists despite these efforts, it is essential to consult a certified mechanic or visit a Lexus dealership for a thorough diagnosis. Taking these steps not only enhances your driving safety but also helps prevent further damage to your vehicle, making it imperative to address the tire pressure warning light without delay.

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