2020 Lexus LS500 Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2020 Lexus LS500: 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 2020 Lexus LS500 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 2020 Lexus LS500 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 2020 Lexus LS500?

To effectively diagnose the tire pressure warning light issue in your 2020 Lexus LS500, 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 outlined 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, attempt to reset the tire pressure monitoring system, as this can sometimes clear false alerts. Additionally, examine the valve stems for any signs of damage or leaks that might be contributing to the issue. If the warning light remains illuminated after these checks, it may be time to consult a mechanic or dealership for a comprehensive diagnosis, ensuring that any underlying issues are properly addressed. By following this diagnostic approach, you can systematically identify and resolve the cause of the tire pressure warning light in your Lexus LS500.

What could be causing the tire pressure warning light to remain on in a 2020 Lexus LS500?

When the tire pressure warning light remains illuminated in your 2020 Lexus LS500, it can be frustrating, but understanding the common problems can help you troubleshoot effectively. One of the primary culprits is low tire pressure, which is easily 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, leading to incorrect readings, and may require replacement. Additionally, the batteries in the sensors can deplete over time, causing them to fail; replacing these batteries might resolve the issue. Calibration of the sensors is another factor to consider, as they may need to be reset to provide accurate readings. Lastly, external factors such as temperature fluctuations or physical damage from rough driving conditions can also affect the sensors and tire pressure. By systematically checking these areas, you can identify and address the reason behind the persistent warning light.

What should I do if the tire pressure warning light on my 2020 Lexus LS500 stays on?

If the tire pressure warning light on your 2020 Lexus LS500 stays illuminated, it is essential to act quickly to avoid potential safety hazards and costly repairs. Neglecting this warning can lead to dangerous driving conditions, including decreased traction and increased tire wear, which may result in a tire blowout or other serious incidents. Begin by checking the tire pressure of all four tires, including the spare, using a reliable tire pressure gauge to ensure they are inflated to the manufacturer's recommended levels. If you discover any underinflated tires, inflate them to the correct pressure without delay. Additionally, carefully inspect each tire for any signs of damage, such as punctures, cuts, or bulges, as these issues can significantly affect your vehicle's safety. Once you have made the necessary adjustments, you may need to reset the tire pressure monitoring system, which is usually accessible through your vehicle's onboard menu. If the warning light remains on after these steps, it is wise to seek assistance from a qualified mechanic or visit a Lexus dealership for further evaluation. By addressing the tire pressure warning light promptly, you not only enhance your vehicle's performance but also ensure a safer driving experience.

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