Mercedes-Benz Key Fob Battery Dead, Spare Key or Keys Locked in the Car?

Mercedes-Benz cars in Singapore

Mercedes-Benz is one of Singapore's best-selling luxury brands, with the C-Class, E-Class and GLC especially common in condo carparks and company fleets. We work on Mercedes-Benz models including the A-Class, C-Class, E-Class, GLA, GLC and S-Class.

A typical Mercedes-Benz call

This is the kind of Mercedes-Benz call we often get: A C-Class owner in a condo carpark presses the fob and nothing happens: the battery has finally died. The car is KEYLESS-GO, so they've never used the hidden key blade. We talk them through sliding it out over WhatsApp, and they're in within a minute, no call-out needed. They book a spare fob for later.

What's different about Mercedes-Benz keys

With KEYLESS-GO you rarely take the fob out, so many owners don't know where the emergency key blade is or where the hidden keyhole on the door handle sits. Learning both takes a minute and can save a call-out. Many Mercedes-Benz models use a smart key, often with KEYLESS-GO so you can unlock and start without taking the key out. An emergency key blade usually slides out of the fob for the door lock.

Mercedes-Benz key fob battery dead? How to get in and start

1. Get in: Slide the catch on the back of the fob to release the emergency key blade. On many models the door keyhole is hidden under a cover on the driver's handle.
2. Start the car: On models with a key slot, insert the fob as normal. On many newer models without a slot, place the fob in the spot marked with a key symbol (often in the centre console tray or a cup holder), then press start.

Details vary by year, so check your manual. Still stuck? Call us. Key locked inside instead? See keys locked in the car.

Mercedes-Benz key fob battery replacement

Most Mercedes-Benz fobs take a 3V coin cell (often CR2032 or CR2025): copy the type printed on the old one and fit the new cell the same way up. Not working after the swap? See key fob not working after a battery change; if the backup start above works, the Mercedes-Benz fob itself is fine.

Mercedes-Benz spare key

Down to one Mercedes-Benz key? We clone Mercedes-Benz remote key fobs from a working key, after checking your NRIC against the log card. We don't clone smart (keyless) keys. Cloning costs S$100–S$1,000 depending on the car, so WhatsApp 9224 9224 the model, year and a key photo to confirm first.

Tips for Mercedes-Benz owners

• Learn how to release the emergency key blade from your fob; on most models it slides out from the back.
• Keyless entry keys can drain faster if stored near the car. Keep the spare away from the garage.
• Company fleet managers: keep a spare fob for each car to avoid downtime.

Independent locksmith, not affiliated with Mercedes-Benz. All prices.

Related: BMW · Audi · Lexus · spare key fob cloning · all car brands