2018 Mazda CX-9 Tire Pressure Warning Light Stays On

Address Tire Pressure Warning Light in 2018 Mazda CX-9 for Safe Driving Conditions

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Reviewed by
Bo Fader
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 Mazda CX-9 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 Mazda CX-9 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 are the initial steps to diagnose the tire pressure warning light on a 2018 Mazda CX-9?

To effectively diagnose the tire pressure warning light on your 2018 Mazda CX-9, begin with a thorough check of the tire pressure in all four tires using a reliable tire pressure gauge. Ensure that each tire is inflated to the levels recommended in your owner's manual, as incorrect pressure is a common cause for the warning light. Next, conduct a visual inspection of the tires, looking for any visible damage such as cuts, punctures, or bulges that could indicate a problem. If the tires appear to be in good condition, proceed to reset the tire pressure monitoring system according to the instructions in your owner's manual, as this can sometimes clear false alarms. Additionally, inspect the valve stems for any signs of damage or leaks, as these can also trigger the warning light. If, after completing these steps, the warning light remains illuminated, it may be time to consult a professional mechanic to investigate potential underlying issues with the tire pressure monitoring system. By following this methodical approach, you can efficiently diagnose and address the tire pressure warning light on your vehicle.

What could be causing the tire pressure warning light to stay on in a 2018 Mazda CX-9?

When the tire pressure warning light remains illuminated in your 2018 Mazda CX-9, it’s essential to understand the common problems that could be causing this issue. One of the primary culprits is low tire pressure, which can easily be checked and adjusted to the manufacturer’s recommended levels. If the pressure is adequate, the problem may lie with a faulty tire pressure sensor, which could require replacement to restore proper functionality. Additionally, the sensor's battery might be low or dead, necessitating a battery replacement to ensure accurate readings. In some instances, the sensors may need recalibration to provide correct data, a process that can often be performed at home or by a professional. Lastly, a malfunction within the tire pressure monitoring system itself could be the root cause, which may require diagnostic tools and expertise to resolve. Addressing these issues promptly is crucial for maintaining the safety and performance of your vehicle, so regular checks and maintenance are highly recommended.

How urgent is it to address the tire pressure warning light on my 2018 Mazda CX-9?

Addressing the tire pressure warning light on your 2018 Mazda CX-9 is not just a matter of convenience; it is a critical safety issue that requires immediate attention. Ignoring this warning can lead to serious safety concerns, as improper tire pressure significantly affects your vehicle's handling, braking, and overall stability on the road. Additionally, driving with incorrect tire pressure can result in uneven tire wear, which not only diminishes performance but also impacts fuel efficiency, leading to higher costs over time. The risk of tire blowouts increases with underinflated tires, posing a severe danger, especially at high speeds. Furthermore, neglecting to address low tire pressure can cause irreversible damage to your tires and wheels, resulting in costly repairs. Therefore, it is essential to regularly check and maintain proper tire pressure to ensure your safety and the longevity of your Mazda CX-9.

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