2018 BMW 320i XDrive Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2018 BMW 320i xDrive

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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 2018 BMW 320i 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 2018 BMW 320i 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 in my 2018 BMW 320i xDrive?

To effectively diagnose the tire pressure warning light issue in your 2018 BMW 320i xDrive, begin with a straightforward approach that prioritizes simpler solutions before delving into more complex diagnostics. Start by manually checking the tire pressure in all four tires using a reliable tire pressure gauge, ensuring that the readings align with the manufacturer's recommended levels found in your owner's manual or on the sticker located inside the driver's door jamb. Next, conduct a thorough visual inspection of each tire for any signs of damage, such as punctures, cuts, or bulges, as these can lead to pressure loss and trigger the warning light. If the tire pressure appears correct and no visible damage is present, proceed to reset the tire pressure monitoring system (TPMS) according to the instructions in your vehicle's manual, as this can sometimes resolve the issue. Additionally, remember to check the pressure of your spare tire, as a low reading here can also activate the warning light. If, after completing these steps, the warning light remains illuminated, it may be time to consult a mechanic or a BMW dealership for a more comprehensive diagnosis and potential repairs. By following this methodical approach, you can efficiently address the tire pressure warning light issue and ensure your vehicle's safety and performance.

What could cause the tire pressure warning light to stay on in a 2018 BMW 320i xDrive?

When the tire pressure warning light stays on in a 2018 BMW 320i xDrive, it is essential to identify the underlying issues to ensure safe driving conditions. The most common reason for this warning light is low tire pressure, which can result from natural air loss or punctures. Regularly checking and inflating your tires to the recommended levels is vital for optimal vehicle performance. Another possibility is a faulty tire pressure sensor; if the sensor is not functioning correctly, it may need to be replaced to resolve the issue. Additionally, the sensors might require recalibration, particularly after tire rotations or replacements, to ensure they provide accurate readings. Electrical faults within the tire pressure monitoring system can also cause the warning light to remain illuminated, which would necessitate a diagnostic check to identify the specific problem. Lastly, be aware that colder weather can lead to a decrease in tire pressure, triggering the warning light. By addressing these potential issues promptly, you can maintain the safety and efficiency of your BMW.

How urgent is it to address the tire pressure warning light on my 2018 BMW 320i xDrive?

Addressing the tire pressure warning light on your 2018 BMW 320i xDrive is not just a matter of convenience; it is a critical safety concern that requires immediate attention. Ignoring this warning can lead to dangerous driving conditions, as improper tire pressure significantly impacts your vehicle's handling and braking capabilities. Moreover, driving on underinflated tires can accelerate tire wear and diminish fuel efficiency, leading to increased costs over time. The risk of tire damage, including blowouts or flats, escalates when tire pressure is neglected, particularly at higher speeds or on uneven surfaces. Additionally, maintaining the correct tire pressure is essential for optimal vehicle performance, affecting traction and cornering stability. Therefore, it is imperative to address the tire pressure warning light without delay to ensure your safety, protect your investment in your vehicle, and enhance your overall driving experience.

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2018 BMW 320i xDrive Tire Pressure Warning Light Solutions