2012 Lexus RX350 Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2012 Lexus RX350: Causes and Solutions

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Reviewed by
Devin Cabugcal
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 2012 Lexus RX350 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 2012 Lexus RX350 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 2012 Lexus RX350?

To effectively diagnose the tire pressure warning light issue in your 2012 Lexus RX350, begin with a straightforward diagnostic approach that prioritizes simpler solutions before delving into more complex problems. Start by checking the tire pressure in all four tires using a reliable tire pressure gauge, ensuring that the readings align with the recommended PSI found in your owner's manual or on the driver's side door jamb. Next, conduct a thorough visual inspection of each tire for any signs of damage, such as punctures or bulges, which could indicate a loss of pressure. Additionally, look for potential leaks by examining the valve stems and tread area; a simple soap and water solution can help reveal any escaping air through the formation of bubbles. If everything appears normal, consider resetting the Tire Pressure Monitoring System (TPMS) as temporary fluctuations can sometimes trigger the warning light. However, if the light remains illuminated despite these efforts, it may be prudent to consult a mechanic for a professional diagnosis, ensuring that any underlying issues are addressed promptly. By following this methodical approach, you can effectively troubleshoot the tire pressure warning light and maintain the safety and performance of your vehicle.

What could cause the tire pressure warning light to stay on in a 2012 Lexus RX350?

When the tire pressure warning light stays on in a 2012 Lexus RX350, it is essential to identify the underlying issues that may be causing this alert. One of the most frequent reasons is low tire pressure, which can result from natural air loss or changes in temperature, particularly during colder months. Regularly checking and adjusting the tire pressure to the manufacturer's recommended levels is vital for ensuring safety and optimal vehicle performance. Another possibility is a malfunctioning tire pressure sensor; if the sensor is defective, it may need to be replaced to restore accurate monitoring. Additionally, the tire pressure monitoring system (TPMS) can experience malfunctions that lead to incorrect readings, keeping the warning light illuminated. Electrical issues within the TPMS or its wiring can also contribute to this problem, making it necessary to inspect the system thoroughly. If all components appear to be functioning correctly, a system reset may be required to clear the warning light, a procedure typically outlined in the vehicle's owner's manual. By addressing these common issues, you can effectively troubleshoot and resolve the tire pressure warning light concern in your Lexus RX350.

How urgent is it to address the tire pressure warning light that stays on in a 2012 Lexus RX350?

Addressing the tire pressure warning light that remains illuminated in your 2012 Lexus RX350 is not just a matter of convenience; it is a critical safety concern that demands immediate attention. Low tire pressure can severely compromise your vehicle's handling and braking capabilities, increasing the likelihood of accidents, particularly in challenging driving conditions. Furthermore, driving on underinflated tires can lead to uneven wear, significantly shortening their lifespan and raising the risk of a blowout while on the road. This not only endangers your safety but can also lead to costly repairs. Additionally, neglecting this warning can negatively impact your vehicle's fuel efficiency, resulting in higher fuel costs over time. The Tire Pressure Monitoring System (TPMS) is designed to alert you to these issues, and ignoring its signals could indicate a malfunction that requires professional diagnosis. Therefore, it is essential to check and adjust your tire pressure promptly or consult a mechanic to ensure your vehicle remains safe and efficient on the road.

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2012 Lexus RX350 Tire Pressure Warning Light Solutions