2019 Mercedes-Benz S450 Key Won't Turn

Troubleshooting Steps to Resolve Key Ignition Issues in Your 2019 Mercedes-Benz S450

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
35% chance it's the
Binding Steering Column/Lock
0%
27% chance it's the
Ignition Switch
0%
20% chance it's the
Ignition Key
0%
18% chance it's
Something else
The most common reasons a 2019 Mercedes-Benz S450 key won't turn are a binding steering column/lock, an ignition switch issue, or a problem with the ignition key.
  • Binding Steering Column/Lock: A binding steering column or lock can occur due to a worn or damaged steering column assembly or issues with the ignition lock mechanism.
  • Ignition Switch: A faulty ignition switch can prevent the engine from starting or cause intermittent electrical issues, affecting the vehicle's ability to run properly.
  • Ignition Key: A worn or damaged ignition key or ignition cylinder can prevent the key from turning, leading to starting issues.
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.

What are the potential causes for the key not turning in the ignition of a 2019 Mercedes-Benz S450?

When faced with the frustrating issue of a key not turning in the ignition of a 2019 Mercedes-Benz S450, it's essential to approach the problem methodically. Start by checking the simplest potential cause: the steering wheel lock. If the steering wheel is locked, gently turning it left and right while attempting to turn the key can often resolve the issue. Next, inspect the key itself for any signs of wear or damage, as a compromised key may need replacement or reprogramming. If these initial checks do not yield results, consider the condition of the vehicle's battery; a dead or weak battery can prevent the ignition system from functioning properly. If the battery is in good shape, the next step is to examine the ignition cylinder for any faults or damage, as internal issues can hinder the key's movement. Lastly, if all else fails, the ignition switch may be the culprit, requiring professional inspection and potential replacement. By following this diagnostic approach, you can systematically identify and address the issue, ensuring a smoother resolution to the problem.

What are the common problems that could cause the key to not turn in a 2019 Mercedes-Benz S450?

When faced with the frustrating issue of a key that won't turn in a 2019 Mercedes-Benz S450, it's essential to consider several common problems that could be at play. One of the first things to check is whether the steering wheel lock is engaged; this often occurs if the steering wheel was turned after the engine was turned off, making it difficult to insert or turn the key. Additionally, a weak or dead battery in the key fob can hinder the ignition system's ability to recognize the key, so replacing the battery may resolve the issue. It's also worth examining the ignition switch itself, as wear and tear or electrical malfunctions can prevent the key from turning smoothly. If the key shows signs of damage or excessive wear, it may not engage properly with the ignition, necessitating a replacement. Lastly, ensure that the steering column is not locked, as this can also obstruct the key's movement. By systematically addressing these potential issues, you can effectively troubleshoot and resolve the problem of a key that won't turn in your vehicle.

How urgent is it to address the issue of a key not turning in a 2019 Mercedes-Benz S450?

When faced with a key that won't turn in your 2019 Mercedes-Benz S450, it's crucial to recognize the urgency of the situation. Ignoring this issue can lead to significant inconveniences, such as being unable to start your vehicle, which can disrupt your daily activities and travel plans. Moreover, a malfunctioning ignition system poses safety risks, potentially leaving you stranded in an unsafe environment. Forcing the key to turn can exacerbate the problem, risking damage to both the ignition system and the key itself, which could result in costly repairs. Promptly addressing this issue allows for a professional diagnostic check, ensuring that the root cause is identified and resolved before it leads to further complications. Therefore, it is essential to act quickly to maintain your vehicle's functionality and your safety on the road.

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Why Your 2019 Mercedes-Benz S450 Key Won't Turn | RepairPal