2023 Mercedes-Benz Metris Key Fob Programming

Quick reference

Step-by-step on-board programming

On-board programming is NOT supported for the 2023 Mercedes-Benz Metris. Mercedes-Benz vehicles, including the Metris, utilize advanced security systems that require specialized diagnostic equipment to program new key fobs. This process typically involves linking the new fob to the vehicle's immobilizer system using manufacturer-specific software. As a result, DIY programming is not possible for this model year.

Battery replacement

1. Locate the small release tab or button on the side or back of the key fob. Press it to release the emergency key blade. Pull the emergency key blade out.
2. With the emergency key removed, you will see a small slot. Insert a thin, flat-head screwdriver or a coin into this slot and gently twist to separate the two halves of the key fob casing.
3. Carefully remove the circuit board component (if it comes out easily) and locate the CR2032 battery. Note the orientation of the battery (positive side up).
4. Gently pry out the old battery using a small screwdriver or your fingernail.
5. Insert the new CR2032 battery with the positive (+) side facing up.
6. Align the two halves of the key fob casing and firmly press them back together until they click into place.
7. Reinsert the emergency key blade into the fob until it locks.

Where to buy a replacement fob

• Mercedes-Benz Dealership: This is the most reliable option for obtaining a genuine key fob, ensuring full compatibility and functionality. However, it is typically the most expensive, with costs ranging from $300 to $600 or more for the fob itself, plus programming fees.
• Automotive Locksmith: An automotive locksmith specializing in European vehicles can often provide and program a new key fob. They may offer genuine Mercedes-Benz parts or high-quality aftermarket alternatives. Locksmiths generally offer a more competitive price than dealerships, often in the range of $250 to $500, including programming.
• Amazon/Online Retailers: While you might find seemingly compatible key fob shells or even complete fobs online, exercise extreme caution. For the 2023 Metris, a blank fob from an online retailer will still require specialized programming and an emergency key blade cut by a professional. The risk of purchasing an incompatible or non-functional fob is very high, making DIY acquisition largely impractical for this model.

If on-board programming isn't supported

As established, on-board programming is not supported for the 2023 Mercedes-Benz Metris due to its sophisticated immobilizer system. New key fobs must be programmed using specialized diagnostic equipment that communicates with the vehicle's Immobilizer Transponder System. This system prevents the vehicle from starting unless the correct transponder chip in the key fob is recognized. This is a security measure designed to deter theft.

Cost Expectations:

• Expect to pay for both the key fob itself and the programming service. As mentioned above, costs can range significantly depending on whether you go through a dealer or an independent automotive locksmith. Always get a clear quote upfront that includes both parts and labor.
• Emergency Key Blade: The physical key blade that slides into the fob serves as an emergency backup. This blade also needs to be cut to match your vehicle's lock cylinders. This is an additional service and cost that dealerships and locksmiths will provide.

Find a mobile locksmith or shop on Repairius.