2020 Mercedes-Benz Metris Key Fob Programming Guide

Quick reference

Step-by-step on-board programming

Unfortunately, the 2020 Mercedes-Benz Metris does not support DIY, on-board programming for its key fobs. Mercedes-Benz vehicles, especially models like the Metris, utilize advanced security systems that require specialized diagnostic equipment to program new keys or fobs.

This means you will need to visit a Mercedes-Benz dealership or an independent automotive locksmith who possesses the necessary tools and software to perform the programming. Attempting to program a key fob without the correct equipment can lead to immobilizer issues and potentially render your vehicle inoperable.

Battery replacement

1. Locate the small release button or tab 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 blade removed, you'll see a small slot. Insert a thin, flat tool (like a small screwdriver or coin) into this slot.
3. Gently twist the tool to pry open the two halves of the key fob case.
4. Carefully remove the old CR2032 battery. Note the orientation (+/-).
5. Insert the new CR2032 battery with the positive (+) side facing up.
6. Align the two halves of the key fob case and press them together until they click securely.
7. Reinsert the emergency key blade.

Where to buy a replacement fob

• Mercedes-Benz Dealership: This is the most reliable option for purchasing an OEM replacement key fob. They will ensure you get the correct part and program it for your vehicle. The downside is the cost, which can be significantly higher than other options, typically ranging from $300 to $600, including the fob and programming.

• Automotive Locksmith: Many independent automotive locksmiths can provide and program replacement key fobs for Mercedes-Benz vehicles. They often have access to aftermarket fobs that are compatible and can program them at a lower cost than a dealership. Expect to pay between $200 and $450 for a new fob and programming through a locksmith.

• Online Retailers (e.g., Amazon, eBay): You can find unprogrammed key fobs online at a much lower price (often $50-$150). However, be extremely cautious. Ensure the FCC ID and part number match your original fob exactly. Remember that purchasing online will still require you to pay a dealership or locksmith for programming and key cutting, adding to the overall cost and potential complications if the fob isn't fully compatible.

If on-board programming isn't supported

As mentioned, on-board programming is not an option for the 2020 Mercedes-Benz Metris. When you need a new key fob, you'll absolutely need professional assistance from either a dealership or a specialized automotive locksmith.

The immobilizer system in your Metris is a sophisticated anti-theft measure. When a new key fob is programmed, it needs to be securely linked to the vehicle's immobilizer to allow the engine to start. This process involves specialist diagnostic equipment to read security codes and write the new key data to the vehicle's computer. This ensures that only authorized keys can start your vehicle.

Expect the total cost for a new fob, cutting of the emergency key blade (if applicable), and programming to be in the range of $200 to $600, depending on your chosen service provider and the type of fob (OEM vs. aftermarket) you opt for.

Find a mobile locksmith or shop on Repairius.