2018 Mercedes-Benz E43 AMG Tire Pressure Warning Light Stays On

Tire Pressure Warning Light in 2018 Mercedes-Benz E43 AMG: Causes and Solutions

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Reviewed by
Aisha
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 Mercedes-Benz E43 AMG 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 Mercedes-Benz E43 AMG 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 are the initial steps to diagnose a tire pressure warning light that stays on in a 2018 Mercedes-Benz E43 AMG?

When faced with a tire pressure warning light that remains illuminated in your 2018 Mercedes-Benz E43 AMG, it's essential to adopt a systematic diagnostic approach. Begin by checking the tire pressure in all four tires, including the spare, ensuring they align with the manufacturer's recommended levels found in the owner's manual or on the door jamb sticker. Next, inspect the tires for any visible damage such as punctures or bulges, as these can lead to pressure loss and trigger the warning light. If the tire pressure is correct and the tires appear undamaged, consider resetting the tire pressure monitoring system (TPMS) according to the instructions in your vehicle's manual, as this can sometimes resolve the issue. If the light persists, it may indicate a malfunctioning tire pressure sensor, which would require professional diagnosis and potential replacement. Additionally, keep in mind that environmental factors, such as extreme temperature fluctuations, can affect tire pressure readings, so ensure your checks are conducted under optimal conditions. By following this methodical approach, you can effectively diagnose and address the tire pressure warning light issue in your vehicle.

What could be causing the tire pressure warning light to remain on in a 2018 Mercedes-Benz E43 AMG?

When the tire pressure warning light remains illuminated in a 2018 Mercedes-Benz E43 AMG, it can signal several underlying issues that DIY enthusiasts can address. The most common reason is low tire pressure; therefore, checking and inflating your tires to the recommended levels is a simple yet effective first step. If the tire pressure is adequate, the next possibility is a malfunctioning tire pressure sensor, which may need replacement or recalibration. Additionally, the sensors rely on batteries that can wear out, so it's wise to check for any dead batteries that could hinder their functionality. Another area to inspect is the wiring and connections associated with the tire pressure monitoring system, as any damage or loose connections can prevent proper communication and keep the warning light on. Lastly, if everything appears normal, the system might require recalibration to ensure accurate readings. By promptly addressing these issues, you not only enhance your vehicle's safety but also maintain its performance, underscoring the importance of regular tire pressure monitoring and maintenance for all car owners.

What immediate steps should be taken if the tire pressure warning light remains on in a 2018 Mercedes-Benz E43 AMG?

When the tire pressure warning light remains illuminated in your 2018 Mercedes-Benz E43 AMG, it is crucial to act swiftly to avoid potential safety hazards and costly repairs. Start by checking the tire pressure in all four tires with a reliable gauge, ensuring that each tire is inflated to the manufacturer's recommended levels, which can be found in your owner's manual or on the sticker inside the driver's door. If you discover any discrepancies, promptly inflate or deflate the tires to the correct pressure, as maintaining proper tire inflation is vital for safe handling and fuel efficiency. Next, conduct a thorough visual inspection of the tires for any signs of damage, such as cuts or punctures, which could compromise your safety on the road. If you find any issues, replacing the damaged tire is essential. After addressing the tire pressure and inspecting for damage, reset the Tire Pressure Monitoring System (TPMS) according to your vehicle's manual to ensure it accurately reflects the new tire conditions. However, if the warning light persists despite these measures, it is imperative to seek professional assistance, as there may be underlying issues with the TPMS that require expert diagnosis. Taking these immediate steps not only enhances your safety but also helps prevent further damage to your vehicle, ensuring a smoother and more secure driving experience.

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2018 Mercedes-Benz E43 AMG Tire Pressure Warning Light Fixes