2020 BMW 840i XDrive Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2020 BMW 840i xDrive

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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 2020 BMW 840i xDrive 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 BMW 840i xDrive 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 on my 2020 BMW 840i xDrive?

To effectively diagnose the tire pressure warning light issue on your 2020 BMW 840i xDrive, begin with a thorough check of the tire pressure across all four tires using a reliable tire pressure gauge. It's crucial to ensure that the pressure aligns with the manufacturer's specifications, which can typically be found in the owner's manual or on a label located inside the driver's door jamb. Next, conduct a visual inspection of each tire for any signs of damage, such as punctures, cuts, or bulges, and look for any foreign objects that may be embedded in the tread, as these could lead to air leaks. If the tire pressure appears normal and the tires are in good condition, proceed to reset the tire pressure monitoring system following the guidelines in your owner's manual, as this can sometimes resolve temporary warning light activations. However, if the warning light remains illuminated after these steps, it may indicate a more serious underlying issue, such as a malfunctioning sensor or an undetected leak, at which point consulting a professional mechanic or a BMW service center is advisable for a comprehensive diagnosis and repair. By systematically addressing these areas, you can ensure your vehicle's safety and optimal performance on the road.

What could be causing the tire pressure warning light to stay on in a 2020 BMW 840i xDrive?

When the tire pressure warning light remains illuminated in your 2020 BMW 840i xDrive, it can be frustrating, but understanding the common problems can help you diagnose the issue. Start by checking the tire pressure in all four tires, as low pressure is the most frequent culprit. If the pressure is adequate, consider the possibility of a faulty tire pressure sensor, which may require replacement. Additionally, sensor calibration issues can arise, necessitating a visit to a BMW service center for proper recalibration. Inspecting your tires for any visible damage or slow leaks is also crucial, as these can lead to pressure loss. Be mindful of the weather, as colder temperatures can cause tire pressure to drop, prompting the warning light to activate. Lastly, if electrical issues within the tire pressure monitoring system (TPMS) are suspected, further diagnosis may be needed. If you've addressed these common problems and the warning light persists, consulting a certified BMW technician is recommended to ensure your vehicle's safety and performance.

What immediate actions should be taken if the tire pressure warning light remains on in a 2020 BMW 840i xDrive?

When the tire pressure warning light remains illuminated in your 2020 BMW 840i xDrive, it is crucial to act promptly to avoid serious safety risks and potential damage to your vehicle. Ignoring this warning can lead to decreased handling, increased tire wear, and even tire blowouts, which can compromise your safety on the road. Start by checking the tire pressure in all four tires with a reliable gauge, ensuring they are inflated to the manufacturer's recommended levels. If you find any discrepancies, adjust the pressure accordingly, as proper inflation is vital for optimal performance and safety. Next, inspect each tire for visible damage such as punctures or bulges; any damaged tire should be repaired or replaced immediately to prevent further issues. After addressing the tire pressures and any damage, reset the tire pressure monitoring system to clear the warning light. If the light persists despite these efforts, it is essential to consult a qualified mechanic or BMW service center, as there may be a deeper issue with the monitoring system that requires professional intervention. Taking these steps not only ensures your safety but also helps maintain the longevity and performance of your vehicle.

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