2021 Audi RS5 Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2021 Audi RS5: Causes and Solutions

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Reviewed by
Andrew Hajjar
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 Audi RS5 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 Audi RS5 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 of a TPMS control module failure are failing to alert the driver of underinflation or overinflation of one or more tires, failure to communicate with the body control module or TPMS sensors, or erroneously reporting incorrect tire pressure.

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 Audi RS5?

When diagnosing the tire pressure warning light issue in your 2021 Audi RS5, it's essential to adopt a systematic approach that prioritizes simpler solutions before moving on to more complex diagnostics. Begin by manually checking the tire pressure in all four tires with a reliable tire pressure gauge, ensuring that the readings align with the recommended levels found in your vehicle's manual. This initial step can often resolve the warning light if the pressure is simply low. Next, conduct a thorough visual inspection of each tire for any signs of damage, such as punctures, cuts, or bulges, and check for foreign objects that may be causing a leak. If the tire pressure is correct and the tires appear undamaged, the next step is to reset the tire pressure monitoring system (TPMS), as it may require recalibration. Refer to your owner's manual for specific instructions on how to perform this reset. If the warning light remains illuminated despite these efforts, it may be time to consult a certified mechanic or an Audi dealership for a professional diagnosis, as there could be underlying issues that require expert attention. By following this structured diagnostic approach, you can effectively address the tire pressure warning light issue in your Audi RS5.

What could be causing the tire pressure warning light to stay on in a 2021 Audi RS5?

When the tire pressure warning light remains illuminated in your 2021 Audi RS5, 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 malfunction and fail to provide accurate readings. In some cases, recalibrating the sensors may resolve the issue, as they can sometimes lose their calibration over time. Additionally, inspect your tires for any visible damage or punctures, as these can lead to air loss and trigger the warning light. Lastly, if you suspect an electrical fault within the system, it may require professional diagnostics to pinpoint the problem. By systematically checking these common issues, you can often identify the cause of the persistent warning light and take appropriate action.

What should I do if the tire pressure warning light stays on in my 2021 Audi RS5?

When the tire pressure warning light remains illuminated in your 2021 Audi RS5, it is crucial to act promptly to avoid potential safety hazards and costly repairs. Ignoring this warning can lead to decreased vehicle handling, increased tire wear, and even tire blowouts, which pose serious risks while driving. Start by checking the tire pressure in all four tires, ensuring they meet the manufacturer's recommended levels. If any tires are underinflated, inflate them accordingly to restore optimal performance. Additionally, inspect the tires for any visible damage, such as punctures or bulges, as these can compromise safety and necessitate immediate repair or replacement. After addressing any pressure or damage issues, resetting the tire pressure monitoring system is essential to clear the warning light. If the light persists despite your efforts, seeking professional assistance from a certified Audi technician is advisable, as they can accurately diagnose and resolve underlying issues. Taking these steps not only enhances your vehicle's safety but also prolongs the lifespan of your tires, ensuring a smoother and safer driving experience.

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