Lexus Tire Pressure Light On But Tires Are Full (Causes and Solutions)

As a Lexus car owner, it is alarming to see the tire pressure light illuminate your dashboard even more when you find out your tires are fully inflated. This situation leaves you worried and confused about the cause of the problem and what steps to take to fix it.

Faulty tire pressure sensors can cause the Lexus tire pressure light to come on. Replacing the faulty tire pressure sensors can fix this issue.

There are other causes and fixes for the tire pressure warning light. In this article, we will explore the possible causes of the Lexus tire pressure light on even though the tires are full and provide solutions to help you solve this issue.

Understanding Why the Tire Pressure Light Comes On Even When the Tires are Full

When the tire pressure light comes on in a Lexus, even though the tires are full, it is a cause for concern for drivers. This warning light indicates that the tire pressure monitoring system (TPMS) has detected a problem with the tire pressure. In most cases, the light will turn on when the pressure in one or more tires is lower than the recommended level.

What Happens When The Tire Pressure Light Comes On Even When The Tires Are Full?

However, in some cases, the light turns on even when the tire pressure is normal. This happens due to a malfunction in the TPMS, designed to alert drivers when the tire pressure is too low or too high. When the TPMS is not functioning properly, it sends false signals to the onboard computer, which triggers the tire pressure light. This is frustrating for drivers who don’t know the problem, even if they have checked the tire pressure and found it within the normal range.

It’s important to note that if the tire pressure light comes on, even if the tires appear fine, it should not be ignored. Continuing to drive with a malfunctioning TPMS puts the driver and passengers at risk, as it affects the vehicle’s handling and potentially causes a tire blowout.

Causes of Tire Pressure Light in Your Lexus Car (Even Though the Tires Are Full)

While it’s always a relief to see that your vehicle’s tires are fully inflated, it is puzzling and concerning to have the tire pressure light illuminate even when the tires are full. This issue has several possible causes, and now we will discuss them:

  • Faulty Tire Pressure Sensors: The tire pressure monitoring system (TPMS) in your Lexus relies on sensors installed in each wheel to detect the tire pressure. These sensors can malfunction, causing the tire pressure light to illuminate even when the tires are fully inflated.
  • Temperature Fluctuations: Temperature changes affect tire pressure. When the outside temperature drops, the tire pressure also drops, leading to the tire pressure light turning on.
  • Electrical Malfunctions: An electrical malfunction in the TPMS or other related components cause the tire pressure light to illuminate even when the tires are full. A blown fuse or a wiring issue is responsible for the malfunction.
  • Damaged Tires Or Wheels: If there is damage to the tire, such as a puncture or a slow leak, the tire pressure light come on even if the other tires are fully inflated. In addition, if there is damage to the wheel, it causes the tire to lose air pressure, triggering the tire pressure light.

Tips to Fix Lexus Tire Pressure Light Issue

Fortunately, there are several solutions to fix the tire pressure light issue, most of which are relatively simple. By following these solutions, you can get your Lexus back on the road safely and with peace of mind.

Check the Tire Pressure

Start by manually checking the tire pressure with a gauge to ensure it is inflated to the recommended pressure level. If they are not, add or release air as needed to reach the recommended level.

Reset the Tire Pressure Monitoring System

If the tire pressure light remains on after inflating the tires to the recommended level, it is necessary to reset the TPMS. The process for doing this vary based on the vehicle model, so consult your owner’s manual for instructions.

Replace Faulty Tire Pressure Sensors

For faulty tire pressure sensors, replace them. A professional mechanic can diagnose the issue and replace the sensors as needed.

Repair Or Replace Damaged Tires Or Wheels

If there is damage to the tire or wheel, it will need to be repaired or replaced. Depending on the damage’s extent, this involves patching the tire, replacing the tire or wheel, or even purchasing a new set of tires.

Visit a Professional Mechanic For Further Diagnosis

After trying the above solution, if you find none of them work, bringing your Lexus to a professional mechanic for further diagnosis is necessary. They will perform a more in-depth analysis of the TPMS and related components to determine the underlying cause of the issue.

Maintaining Proper Tire Pressure in Lexus Vehicles

Maintaining proper tire pressure is a simple yet essential task every Lexus owner should perform regularly. Below are some easy tips for maintaining proper tire pressure:

How To Maintain Proper Tire Pressure In Lexus?

Check Tire Pressure Regularly: You should check the tire pressure at least once a month or before long road trips. It’s best to check the pressure when the tires are cold, meaning the car hasn’t been driven for at least three hours.

Use a Tire Pressure Gauge: A tire pressure gauge is an inexpensive tool that helps you accurately measure tire pressure.

Know the Recommended Tire Pressure: The tire pressure for your Lexus is found in the owner’s manual, on the driver’s side door jamb, or in the glove box. Ensure you know the recommended tire pressure and check it against the reading on your gauge.

Inflate Or Deflate The Tires As Needed: If the tire pressure is too low, you should inflate the tire to the recommended pressure using an air compressor or gas station air pump. If the pressure is too high, release air by pressing the valve stem with a small tool or gauge tip.

Check The Spare Tire: Check the spare tire pressure, too, as you never know when to use it.

Importance of Maintaining Proper Tire Pressure

Maintaining proper tire pressure is crucial for several reasons, primarily for safety and tire life. Here are some of the key reasons why it’s important to keep your Lexus tires properly inflated:

  • Safety: Underinflated tires affect vehicle handling, making it more difficult to control in emergencies. This increases the risk of accidents, especially when driving at high speeds or in inclement weather. Proper tire pressure is essential to maintain good traction and handling, which prevents accidents and keeps you safe on the road.
  • Improved Fuel Efficiency: Tires that are underinflated have increased rolling resistance, causing the engine to work harder and use more fuel. Properly inflated tires improve fuel efficiency and save you money at the gas pump.
  • Longer Tire Life: Underinflated tires wear out more quickly, especially on the edges of the tread. This causes uneven wear patterns, which leads to premature tire failure and the need for replacement. Properly inflated tires extend the life of your tires and save you money in the long run.
  • Improved Handling: Proper tire pressure ensures that your Lexus handles correctly, providing better stability and a smoother ride. This makes your driving experience more comfortable and enjoyable.

Final Words

Maintaining proper tire pressure is an important part of vehicle maintenance that ensure your safety and extend the life of your tires. Don’t panic if you see the tire pressure light come on in your Lexus. Instead, use the solutions outlined in this article to diagnose and fix the issue. 

Whether it’s a simple matter of checking the tire pressure or a more complex issue requiring professional diagnosis and repair, taking action keeps you and your vehicle safe.