2021 Lexus LS500h Tire Pressure Warning Light Stays On

Troubleshooting Tire Pressure Warning Light Issues in Your 2021 Lexus LS500h: Causes and Solutions

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Reviewed by
Bo Fader
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 LS500h 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 LS500h 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 on my 2021 Lexus LS500h?

To effectively diagnose the tire pressure warning light issue on your 2021 Lexus LS500h, 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, proceed to reset the tire pressure monitoring system by following the instructions in your vehicle's manual; this can often recalibrate the sensors and turn off the warning light. Additionally, examine the valve stems for any signs of damage or leaks that might be affecting the system. If, after completing these steps, the warning light remains illuminated, it is advisable to consult a mechanic or authorized service center for a professional diagnosis and repair. By following this diagnostic approach, you can systematically address the issue and ensure your vehicle's safety and performance.

What could cause the tire pressure warning light to stay on in a 2021 Lexus LS500h?

When the tire pressure warning light stays illuminated in a 2021 Lexus LS500h, it is essential to identify the underlying issues that may be causing this alert. The most common reason is low tire pressure, which can result from natural air loss or changes in temperature. Regularly checking and maintaining your tire pressure at the recommended levels is vital for safe driving and optimal vehicle performance. Another possibility is a malfunctioning tire pressure sensor; if the sensor is defective, it may fail to provide accurate readings, keeping the warning light on. Additionally, electrical problems or damage within the sensor system can contribute to this issue. Be aware that extreme temperature fluctuations can also impact tire pressure, so consider how seasonal changes might affect your tires. If you notice any visible damage or punctures, inspect your tires for leaks, as these can lead to decreased pressure. If you have addressed these concerns and the warning light remains on, you may need to reset the tire pressure monitoring system (TPMS) following your vehicle's manual instructions. Should the warning light persist despite these efforts, consulting a professional mechanic is recommended to ensure your vehicle's safety and reliability on the road.

What should I do if the tire pressure warning light stays on in my 2021 Lexus LS500h?

If the tire pressure warning light stays on in your 2021 Lexus LS500h, it is essential to act quickly to avoid potential safety hazards. Neglecting this warning can lead to serious issues such as tire blowouts or compromised vehicle handling, which can endanger you and other road users. Begin by checking the tire pressure in all four tires, including the spare, and ensure they are inflated to the levels specified in your owner's manual. If you find any tires underinflated, use a tire gauge to measure the pressure accurately and an air compressor to inflate them to the correct levels. After adjusting the tire pressure, you may need to reset the tire pressure monitoring system, which is usually done through the vehicle's onboard settings. Additionally, inspect your tires for any visible damage, such as punctures or bulges, as these can also trigger the warning light. If the light remains on despite your efforts, it is wise to consult a certified Lexus service center for a professional diagnosis. Addressing these issues promptly not only enhances your vehicle's performance but also ensures your safety on the road.

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Why Your 2021 Lexus LS500h Tire Pressure Warning Light Stays