2021 Lexus RC300 Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2021 Lexus RC300: Causes and Solutions

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Reviewed by
Andrew Hajjar
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 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 2021 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 steps should I take to diagnose the tire pressure warning light issue in my 2021 Lexus RC300?

To effectively diagnose the tire pressure warning light issue in your 2021 Lexus RC300, 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 affecting the system. If the warning light remains illuminated after these checks, it may be time to consult a mechanic or dealership for a comprehensive diagnosis, ensuring your vehicle's safety and performance are not compromised. By following this diagnostic approach, you can systematically address the issue, starting with the simplest solutions before moving on to more complex assessments.

What are the common causes for the tire pressure warning light to remain on in a 2021 Lexus RC300?

When the tire pressure warning light remains illuminated in your 2021 Lexus RC300, it can be a source of concern, but understanding the common problems can help you address the issue. One of the primary reasons for the warning light is low tire pressure, which can easily be checked with a tire pressure gauge. If you find that the pressure is below the recommended levels, simply inflating the tires can resolve the issue. However, if the pressure is adequate, the problem may lie with a faulty tire pressure sensor. These sensors can malfunction, leading to inaccurate readings and a persistent warning light. Additionally, the batteries in these sensors have a limited lifespan and may need replacement if they are depleted. Calibration is another factor to consider; if the sensors are not properly calibrated, they may trigger false warnings. Furthermore, inspect the wiring and connections associated with the tire pressure monitoring system, as any damage or loose connections can also cause the light to stay on. Lastly, be mindful of extreme temperature changes, as they can affect tire pressure and potentially trigger the warning light. By systematically checking these common issues, you can often resolve the problem without needing professional assistance. However, if the warning light persists, consulting a qualified mechanic or an authorized Lexus service center is advisable for a thorough diagnosis.

What should I do if the tire pressure warning light on my 2021 Lexus RC300 stays on?

When the tire pressure warning light on your 2021 Lexus RC300 remains illuminated, it signals a critical issue that requires immediate attention. Ignoring this warning can lead to unsafe driving conditions, increased tire wear, and potential damage to your vehicle's suspension and handling systems. Start by checking the tire pressure in all tires, including the spare, using a reliable gauge to ensure they meet the manufacturer's specifications. If you find any discrepancies, adjust the pressure accordingly, as both overinflation and underinflation can compromise safety and performance. After correcting the tire pressures, it’s essential to reset the tire pressure monitoring system (TPMS) to clear the warning light, which can typically be done through the vehicle's onboard settings. Additionally, inspect your tires for any visible damage, such as punctures or bulges, which could indicate a more serious problem. If the warning light persists despite these efforts, it’s crucial to consult a certified Lexus technician. They can accurately diagnose the issue and perform necessary repairs, ensuring your vehicle remains safe and reliable on the road. Taking these steps promptly not only protects your safety but also helps prevent costly repairs down the line.

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