2018 Mercedes-Benz Metris Key Fob Programming Guide

Quick reference

Step-by-step on-board programming

The 2018 Mercedes-Benz Metris does not support DIY on-board key fob programming. Mercedes-Benz vehicles, especially those from 2018 onwards, utilize advanced security systems that require specialized diagnostic equipment and software to program new key fobs. This process typically involves coding the new fob to the vehicle's immobilizer system, which can only be done by a certified Mercedes-Benz dealership or a qualified automotive locksmith.

Attempting to program a key fob without the proper tools can result in damage to the vehicle's electronic control units (ECUs) or render the new key fob unusable. It's essential to rely on professionals for this procedure to ensure proper functionality and security.

Battery replacement

Replacing the battery in your 2018 Mercedes-Benz Metris key fob is a straightforward process:

1. Locate the release button: On the back or side of your key fob, you'll find a small release button. Press it to release the emergency key blade.
2. Remove the emergency key blade: Pull out the metal emergency key blade from the fob.
3. Open the fob casing: With the emergency key blade removed, you'll see a small slot. Use a thin, flat object (like a small screwdriver or coin) to gently pry open the two halves of the key fob casing.
4. Remove the old battery: Carefully note the orientation of the old CR2032 battery before removing it. It's usually held in place by small clips.
5. Insert the new battery: Place a new CR2032 battery into the fob, ensuring the positive (+) side is facing up (or as indicated by the original battery's orientation).
6. Close the fob casing: Snap the two halves of the key fob casing back together until you hear a click.
7. Reinsert the emergency key blade: Slide the emergency key blade back into its slot until it locks into place.

Test your key fob to ensure it's working correctly.

Where to buy a replacement fob

When considering a replacement key fob for your 2018 Mercedes-Benz Metris, you have a few options, each with its pros and cons:

• Mercedes-Benz Dealership:

  • Pros: Guaranteed genuine OEM part, programmed by factory-trained technicians, full warranty support.
  • Cons: Most expensive option. Expect to pay anywhere from $300 to $600 or more, including the fob and programming. Programming might require an appointment and take a few hours.

• Automotive Locksmith (e.g., Repairius partner):

  • Pros: Often more affordable than a dealership, can provide genuine or high-quality aftermarket fobs, programming usually done on-site or at their shop, often faster service. Locksmiths have the necessary diagnostic tools and expertise to program Mercedes-Benz keys.
  • Cons: Prices can still vary. Ensure the locksmith is reputable and experienced with Mercedes-Benz vehicles. Ballpark cost can range from $250 to $500, depending on the fob type and programming complexity.

• Online Retailers (e.g., Amazon, eBay):

  • Pros: Potentially the cheapest option for the physical fob itself.
  • Cons: You're only buying the unprogrammed fob. You'll still need to pay for programming from a dealership or locksmith. There's a risk of purchasing a non-genuine or incompatible fob. Often, these fobs do not include the emergency key blade, which will need to be purchased and cut separately. Beware: A blank fob purchased online will still incur programming costs, making the overall cost potentially similar to or even more than a locksmith providing a complete solution.

If on-board programming isn't supported

As established, on-board programming is not an option for your 2018 Mercedes-Benz Metris. This is due to the advanced immobilizer transponder system that is integral to the vehicle's security. Mercedes-Benz vehicles use a sophisticated rolling code encryption system and advanced anti-theft measures that prevent unauthorized key programming.

Immobilizer Transponder: The key fob contains a transponder chip which communicates with the vehicle's immobilizer system. This transponder must be correctly programmed and matched to the vehicle for the engine to start. Even if you were to cut a new key blade, the engine would not start without the transponder being correctly coded.

Cost Expectations: As mentioned above, expect costs to range from $250 to $600+ for a new key fob and programming from a locksmith or dealership. This cost covers the specialized equipment, software, and expertise required to securely integrate a new key into your vehicle's system. The emergency key blade, which is part of the fob, will also need to be cut to match your vehicle's locks.

Find a mobile locksmith or shop on Repairius.