2009 Mercury Milan Tire Pressure Warning Light Stays On

Common Causes for the Tire Pressure Warning Light in Your 2009 Mercury Milan and How to Resolve It

Find Repair Location
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 2009 Mercury Milan 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 tire 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 2009 Mercury Milan 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.

How to diagnose a tire pressure warning light on a 2009 Mercury Milan?

To effectively diagnose the tire pressure warning light on your 2009 Mercury Milan, start by checking the air pressure in all tires, as low pressure is a common trigger for the warning light. Use a reliable tire pressure gauge and inflate any tires that are below the recommended pressure specified in your owner's manual. After ensuring all tires are properly inflated, observe the TPMS light; it should briefly illuminate when you start the vehicle and then turn off. If the light remains on, inspect for signs of tire damage or leaks, as these can also cause the warning to persist. If no visible issues are found, consider the possibility of a malfunctioning Tire Pressure Monitoring System (TPMS) sensor, which may require professional diagnosis. By following this methodical approach, you can efficiently identify and resolve the cause of the tire pressure warning light, ensuring your vehicle remains safe and roadworthy.

What could cause the tire pressure warning light to stay on in a 2009 Mercury Milan?

When the tire pressure warning light stays on in a 2009 Mercury Milan, it often indicates underlying issues that need attention. One of the most frequent culprits is low tire pressure, which can occur due to natural air loss over time or a slow leak in the tires. It's essential to regularly check the tire pressure and ensure it meets the manufacturer's specifications. If the tires are properly inflated and the light remains on, the problem may lie within the tire pressure monitoring system (TPMS) itself. A malfunctioning TPMS sensor, possibly due to dead batteries or damaged wiring, can trigger the warning light even when tire pressures are correct. Additionally, leaks from the wheels or valve stems can also cause the light to stay illuminated. In some cases, temperature fluctuations can lead to a temporary drop in tire pressure, causing the light to flicker or stay on. By understanding these common problems, DIYers can take the necessary steps to troubleshoot and resolve the issue effectively.

What should I do if the tire pressure warning light stays on in my 2009 Mercury Milan?

When the tire pressure warning light remains illuminated in your 2009 Mercury Milan, it is crucial to take immediate action to ensure your safety and the longevity of your vehicle. Ignoring this warning can lead to decreased traction, increased tire wear, and even tire blowouts, which pose significant risks while driving. Start by checking the tire pressure with a reliable gauge, as low pressure is often the primary culprit behind the warning light. If the pressure is adequate, inspect your tires for any visible leaks or damage that could be causing a slow loss of air. Should the tires be in good condition, the issue may lie within the Tire Pressure Monitoring System (TPMS) itself, which may require further inspection or resetting. Additionally, be mindful of temperature changes, as fluctuations can affect tire pressure and trigger the warning light unexpectedly. By addressing these concerns promptly, you not only enhance your driving safety but also prevent potential costly repairs down the line.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.