2018 Lexus GS300 Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2018 Lexus GS300: 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 2018 Lexus GS300 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 2018 Lexus GS300 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 2018 Lexus GS300?

When diagnosing the tire pressure warning light issue in your 2018 Lexus GS300, it's essential to adopt a systematic approach that prioritizes simpler solutions before delving into more complex diagnostics. Begin by checking the tire pressure in all four tires with a reliable tire pressure gauge, ensuring that each tire is inflated to the recommended PSI specified in your vehicle's manual. Next, conduct a thorough visual inspection of the tires for any signs of damage, such as punctures, cuts, or bulges, which could indicate a leak or other issues. If you find that the tire pressure is not within the recommended range, adjust it accordingly by either adding or releasing air. After making these adjustments, consult your car's manual to determine if you need to reset the tire pressure monitoring system, as this step is crucial for the system to accurately reflect the new tire pressures. If the warning light remains illuminated despite these efforts, it may signal a malfunctioning tire pressure sensor, which would require professional inspection and potential replacement. By following this methodical approach, you can effectively address the tire pressure warning light issue and ensure your vehicle's safety and performance.

What could be causing the tire pressure warning light to stay on in a 2018 Lexus GS300?

When the tire pressure warning light remains illuminated in your 2018 Lexus GS300, 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, particularly 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 tire pressure warning light in your Lexus GS300. If the problem persists after these checks, seeking assistance from a professional mechanic is recommended for a thorough diagnosis.

How urgent is it to address the tire pressure warning light on a 2018 Lexus GS300 that stays on?

Addressing the tire pressure warning light on a 2018 Lexus GS300 is not just a matter of convenience; it is a critical safety concern that demands immediate attention. When this warning light remains illuminated, it signals that one or more tires may be underinflated, which can severely compromise vehicle handling and braking performance. This is particularly dangerous in adverse weather conditions, where the risk of accidents increases significantly. Additionally, driving on underinflated tires can lead to uneven wear, resulting in the need for premature tire replacements, which can be costly. Furthermore, low tire pressure negatively impacts fuel efficiency, leading to higher fuel costs over time. Ignoring this warning can also cause irreversible damage to the tires, increasing the likelihood of a blowout while driving. Therefore, it is essential to check the tire pressure, inflate the tires to the recommended levels, and inspect for any leaks or punctures as soon as the warning light stays on. If the light persists despite these measures, it may indicate a more serious underlying issue that requires professional diagnosis. Taking prompt action not only ensures your safety but also protects your vehicle from potential damage and unnecessary expenses.

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2018 Lexus GS300 Tire Pressure Warning Light Causes