2022 Mercedes-Benz Metris Key Fob Programming

Quick reference

Step-by-step on-board programming

Unfortunately, the 2022 Mercedes-Benz Metris does not offer a do-it-yourself (DIY) or on-board programming procedure for new key fobs. This is because Mercedes-Benz vehicles use a sophisticated security and immobilizer system to prevent theft.

Programming a new key requires specialized diagnostic equipment (like the Mercedes-Benz XENTRY system) that communicates with the vehicle's electronic control modules. This equipment is typically only available to authorized Mercedes-Benz dealerships and certified automotive locksmiths with the appropriate tools and subscriptions.

Therefore, you will need to have a professional with the correct equipment program any new or additional keys for your Metris.

Battery replacement

Replacing the batteries in your Metris key fob is a simple task you can do at home.

1. Eject the mechanical key: Locate the small black tab on the back of the fob. Slide it, and the mechanical key will pop out.
2. Open the fob: Insert the mechanical key into the opening where it was housed. Use it as a lever to gently pry open the back cover of the fob.
3. Replace the batteries: The Metris fob uses two CR2025 batteries. Note the orientation of the old batteries before removing them. Insert the new batteries in the same orientation.
4. Reassemble the fob: Snap the back cover into place and re-insert the mechanical key.

Where to buy a replacement fob

• Mercedes-Benz Dealership: This is the most reliable but also the most expensive option. You are guaranteed to receive a genuine OEM key that is programmed correctly. Expect to pay between $400 and $700 for the fob and programming services.
• Certified Automotive Locksmith: A qualified locksmith can often source an OEM key and program it to your vehicle for less than the dealership. This is often the best balance of cost and convenience, with prices typically ranging from $300 to $500. A mobile locksmith can come to you, saving you a trip to the dealer.
• Online (Amazon, eBay, etc.): While you can find fobs for sale online, this is not recommended for the Metris. These are often used keys that are "locked" to another vehicle and cannot be reprogrammed. Mercedes keys are a one-time-programmable part; once paired with a vehicle, they cannot be cleared and re-paired with another. You will likely waste your money and end up needing to buy a key from a dealer or locksmith anyway.

If on-board programming isn't supported

As mentioned, the 2022 Metris requires professional programming. The key fob is not just a remote for locking and unlocking the doors; it contains a critical immobilizer transponder chip. The vehicle's Electronic Ignition Switch (EIS) must recognize this chip to allow the engine to start.

The programming process involves using a diagnostic scan tool to have the vehicle learn and accept the new key's unique transponder code while de-authorizing any lost or stolen keys. This is a security measure that cannot be bypassed. The cost for this service is built into the prices quoted by dealers and locksmiths. The key blade is a laser-cut key that will also need to be cut by the dealer or a locksmith with a laser cutter.

Find a mobile locksmith or shop on Repairius.