2021 Lexus IS350 Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2021 Lexus IS350: 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 IS350 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 IS350 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 IS350?

To effectively diagnose the tire pressure warning light issue on your 2021 Lexus IS350, begin with a thorough assessment of your tire pressure. Utilize a reliable tire pressure gauge to check each tire, ensuring that the readings align with the recommended PSI found in your owner's manual or on the driver's side door jamb. If the pressure is low, inflate the tires accordingly. Next, conduct a visual inspection for any signs of damage, such as punctures or bulges, which could indicate a loss of air. Pay close attention to the valve stems and the tire bead for potential leaks; a simple soap and water solution can help reveal any escaping air through bubbling. If everything appears normal but the warning light remains illuminated, consider resetting the Tire Pressure Monitoring System (TPMS) as temporary fluctuations can sometimes trigger the alert. Should the light persist despite these efforts, it may be time to consult a professional mechanic for a more in-depth diagnosis and repair. By following this structured approach, you can efficiently identify and resolve the issue with your tire pressure warning light.

What could be causing the tire pressure warning light to stay on in a 2021 Lexus IS350?

When the tire pressure warning light remains illuminated in a 2021 Lexus IS350, it can be attributed to several common problems that DIY enthusiasts can investigate. First and foremost, low tire pressure is often the culprit; checking and inflating each tire to the manufacturer's recommended levels is a straightforward task that can resolve the issue. If the tire pressure is adequate, the problem may lie with a faulty tire pressure sensor, which could require replacement if it fails to provide accurate readings. Additionally, the batteries in the TPMS sensors can deplete over time, leading to malfunctions that keep the warning light on; replacing these batteries is another DIY fix. In some cases, recalibrating the sensors may be necessary to ensure they are functioning correctly. Lastly, external factors such as extreme temperature fluctuations or physical damage from rough driving conditions can also trigger the warning light. By systematically checking these potential issues, you can effectively troubleshoot the problem and ensure your vehicle's safety and performance. If the warning light persists after these checks, seeking professional assistance may be the best course of action.

What should I do if the tire pressure warning light on my 2021 Lexus IS350 stays on?

When the tire pressure warning light on your 2021 Lexus IS350 remains illuminated, it is crucial to take immediate action to ensure your safety and the longevity of your vehicle. Ignoring this warning can lead to decreased traction, increased tire wear, and even tire blowouts, which pose significant risks while driving. Start by checking the tire pressure of all four tires with a reliable gauge, ensuring they are inflated to the recommended levels found in your owner's manual or on the sticker inside the driver's side door jamb. If you discover any tires are underinflated, inflate them accordingly. Additionally, inspect each tire for visible damage such as punctures or bulges, as these can compromise your safety and require repair or replacement. After addressing any pressure discrepancies or damage, it is essential to reset the tire pressure monitoring system, which can typically be done through your vehicle's onboard menu. If the warning light persists despite these efforts, seeking professional assistance is advisable to prevent further complications. By taking these steps promptly, you can maintain optimal vehicle performance and ensure a safer driving experience.

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