2019 Lexus RC300 Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2019 Lexus RC300: 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 2019 Lexus RC300 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 2019 Lexus RC300 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 are the initial steps to diagnose a tire pressure warning light that stays on in a 2019 Lexus RC300?

When faced with a tire pressure warning light that remains illuminated in your 2019 Lexus RC300, the first step is to manually check the tire pressure in all four tires, including the spare if applicable. This ensures that each tire is inflated to the manufacturer's recommended levels, which can typically be found on a sticker located inside the driver's side door jamb or in the owner's manual. Next, visually inspect the tires for any signs of damage such as punctures, cuts, or bulges, as these can lead to pressure loss and trigger the warning light. If the tire pressure is correct and there are no visible issues, consider resetting the tire pressure monitoring system (TPMS) to clear any false alerts; instructions for this can be found in the vehicle's manual. If the warning light persists, it may indicate a malfunctioning tire pressure sensor, which can be diagnosed using a professional tool. Should these steps not resolve the issue, it is advisable to consult a certified mechanic or dealership for a comprehensive inspection of the TPMS system. By following this diagnostic approach, you can effectively address the tire pressure warning light and ensure your vehicle's safety on the road.

What could cause the tire pressure warning light to stay on in a 2019 Lexus RC300?

When the tire pressure warning light remains on in your 2019 Lexus RC300, it can be frustrating, but understanding the common problems can help you diagnose the issue. 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 wear out over time and may need replacement. Additionally, sensor calibration issues can arise, especially if tires have been recently changed or rotated, necessitating a recalibration to ensure accurate readings. Electrical faults within the tire pressure monitoring system can also cause the light to stay on, which may require a diagnostic tool to pinpoint the problem. Lastly, check for any obstructions or dirt around the sensors, as these can interfere with their operation. By systematically addressing these potential issues, you can effectively troubleshoot the persistent tire pressure warning light in your Lexus RC300.

How urgent is it to address the tire pressure warning light that stays on in a 2019 Lexus RC300?

Addressing the tire pressure warning light in your 2019 Lexus RC300 is not just a matter of convenience; it is a critical safety concern that requires immediate attention. When this warning light remains illuminated, it signals that your tires may be underinflated, which can severely compromise your vehicle's handling and braking capabilities. Low tire pressure can lead to increased fuel consumption and uneven tire wear, ultimately resulting in costly replacements. Moreover, ignoring this warning could indicate a more serious issue, such as a tire leak or puncture, which poses a significant risk of a flat tire or blowout while driving. To ensure your safety and the longevity of your vehicle, it is essential to regularly check your tire pressure, inflate your tires to the recommended levels, and inspect for any visible damage. If the warning light persists despite these efforts, seeking professional assistance is crucial to diagnose and resolve any underlying issues. Taking prompt action not only enhances your driving experience but also safeguards your well-being on the road.

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