How to Replace the Battery in a BMW Key Fob?
2 Answers
To replace the battery in a BMW key fob, follow these steps: 1. Press the round button on the key fob to remove the mechanical key; 2. Insert a tool into the gap of the key fob and pry it open; 3. Remove the old battery and replace it. Taking the BMW 320i as an example, it is a 4-door, 5-seater midsize sedan with body dimensions of 4719mm in length, 1827mm in width, and 1459mm in height, with a wheelbase of 2851mm. The BMW 320i is equipped with a 2.0L turbocharged engine, delivering a maximum power of 115kW and a maximum torque of 250Nm. It features a rear-wheel-drive layout, with a double-joint spring strut front suspension and a multi-link independent rear suspension.
As a car enthusiast who frequently helps friends with car repairs, I've replaced dozens of BMW key batteries. The operation varies slightly between different key models. For the older blade-style key, there's a small groove on the back—just insert a one-yuan coin and twist firmly to pry open the casing. The smart key is a bit more complicated: first use your fingernail to unclip the side latch, then remove the mechanical key to reveal the battery compartment. Key point to note: while most batteries are CR2032, newer G-series models may require CR2450. During installation, pay attention to the polarity—the standard orientation is metal side up. Before closing the case, remember to test if the unlock button's indicator light functions properly. I recommend spending 10 yuan on Nanfu or Panasonic batteries—don't cheap out with off-brand ones. The whole process takes about five minutes, and with practice, you won't even need tools.
