2021 Toyota Mirai Tire Pressure Warning Light Stays On

Troubleshooting Tire Pressure Warning Light Issues in Your 2021 Toyota Mirai: 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 2021 Toyota Mirai 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 Toyota Mirai 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.

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 Toyota Mirai?

To effectively diagnose the tire pressure warning light issue in your 2021 Toyota Mirai, begin with a straightforward approach that prioritizes simple solutions before delving into more complex diagnostics. 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, inspect each tire for any visible damage, such as punctures or bulges, which could indicate a loss of pressure. If you find any tires that are low, fill them with air to the appropriate level and recheck the pressure to confirm accuracy. After adjusting the tire pressure, it may be necessary to reset the tire pressure monitoring system (TPMS); refer to your owner's manual for specific instructions on how to do this. Once you've completed these steps, take your vehicle for a short drive and observe whether the warning light remains illuminated. If the light persists despite having corrected the tire pressure and reset the system, it may signal a deeper issue within the TPMS that warrants a visit to a certified mechanic for further inspection. By following this methodical approach, you can efficiently address the tire pressure warning light concern in your Mirai.

What could cause the tire pressure warning light to stay on in a 2021 Toyota Mirai?

When the tire pressure warning light stays on in a 2021 Toyota Mirai, it is essential to identify the underlying issues to ensure safe driving and optimal vehicle performance. The most common reason for this warning light is low tire pressure, which can result from natural air loss or punctures. Regularly checking and maintaining the recommended tire pressure is vital for safety. Another possibility is a faulty tire pressure sensor; if the sensor is malfunctioning, it may need to be replaced to restore accurate readings. Additionally, the sensors may require recalibration, which can be performed by a professional to ensure they are functioning correctly. Electrical issues within the tire pressure monitoring system can also cause the warning light to remain illuminated, necessitating a thorough inspection by a qualified technician. Furthermore, be aware that extreme temperature fluctuations can impact tire pressure, potentially triggering the warning light. By addressing these issues promptly and maintaining regular tire pressure checks, you can enhance your vehicle's safety and performance while preventing future problems.

How urgent is it to address the tire pressure warning light on my 2021 Toyota Mirai?

Addressing the tire pressure warning light on your 2021 Toyota Mirai is not just a matter of convenience; it is a critical safety concern that requires immediate attention. When this warning light illuminates, it signals that your tires may be underinflated, which can severely compromise your vehicle's handling and braking capabilities. Ignoring this warning can lead to decreased fuel efficiency and accelerate tire wear, ultimately resulting in costly replacements. Moreover, driving on underinflated tires significantly increases the risk of a blowout, particularly at high speeds, which can pose serious dangers to you and other road users. Therefore, it is essential to check your tire pressure as soon as the warning light appears. By ensuring your tires are inflated to the manufacturer's recommended levels, you not only enhance your safety but also optimize your vehicle's performance and longevity. Taking these proactive steps can save you from potential accidents and costly repairs, making it imperative to act swiftly when the tire pressure warning light comes on.

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