2020 Subaru WRX STI Tire Pressure Warning Light Stays On

Tire Pressure Warning Light in 2020 Subaru WRX STI: 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 2020 Subaru WRX STI 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 2020 Subaru WRX STI 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 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.

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 are the initial steps to diagnose a tire pressure warning light that stays on in a 2020 Subaru WRX STI?

When faced with a tire pressure warning light that remains illuminated in your 2020 Subaru WRX STI, it's essential to adopt a systematic diagnostic approach. Begin by manually checking the tire pressure in all four tires, including the spare, using a reliable tire pressure gauge to ensure they meet the manufacturer's recommended PSI levels. This initial step can often resolve the issue if the tires are under-inflated. Next, inspect each tire for visible damage such as punctures or bulges, as these can lead to pressure loss and trigger the warning light. If the tire pressures are correct and no damage is found, consider resetting the tire pressure monitoring system, which can sometimes clear false alerts. If the warning light persists, it may indicate a malfunction in one of the tire pressure sensors, at which point consulting a certified Subaru service center for a thorough diagnosis is advisable. Always refer to your owner's manual for specific troubleshooting steps tailored to your vehicle, as it can provide valuable insights into the tire pressure monitoring system. By following this structured approach, you can effectively diagnose and address the tire pressure warning light issue in your Subaru WRX STI.

What could cause the tire pressure warning light to remain on in a 2020 Subaru WRX STI?

When the tire pressure warning light remains on in a 2020 Subaru WRX STI, it can signal several underlying issues that are manageable for DIY enthusiasts. The most common cause is low tire pressure, so the first step is to check and inflate your tires to the recommended levels, which is a simple task that can often resolve the warning light. If the tire pressure is adequate, the next consideration should be a faulty tire pressure sensor, which may need replacement if it’s not functioning correctly. Additionally, sensor calibration issues can occur, requiring a recalibration to ensure accurate readings; this can often be done at home by consulting the vehicle's manual. Electrical problems within the tire pressure monitoring system can also lead to the warning light staying on, so inspecting the wiring for any faults is crucial. Moreover, be aware that extreme temperature fluctuations can impact tire pressure and trigger the warning light, necessitating regular monitoring during seasonal changes. Lastly, inspect your tires for any signs of damage or slow leaks, as these can contribute to low pressure and illuminate the warning light. By methodically addressing these potential issues, you can effectively troubleshoot and resolve the tire pressure warning light problem in your Subaru WRX STI.

How urgent is it to address the tire pressure warning light on my 2020 Subaru WRX STI?

Addressing the tire pressure warning light on your 2020 Subaru WRX STI is not just a matter of convenience; it is a critical safety issue that demands immediate attention. Ignoring this warning can lead to dangerous driving conditions, as underinflated tires significantly compromise your vehicle's handling and braking capabilities. This is particularly concerning for a high-performance car like the WRX STI, where precision and stability are paramount. Additionally, neglecting to check your tire pressure can result in uneven tire wear, which not only shortens the lifespan of your tires but may also lead to costly replacements sooner than expected. Furthermore, maintaining the correct tire pressure is essential for optimal fuel efficiency; properly inflated tires can enhance your vehicle's mileage, saving you money at the pump. Therefore, it is imperative to regularly monitor your tire pressure and address any warnings without delay to ensure a safe and efficient driving experience.

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