Experiencing issues with your 2007 BMW 328i key fob after a battery replacement? It’s a common frustration when a seemingly simple task goes awry. Many BMW owners attempt to replace their key fob battery themselves, only to find the key no longer functions correctly, even for basic operations like locking and unlocking doors, or opening the trunk, despite still being able to start the car. Let’s delve into potential causes and solutions if you’re facing this problem after a 2007 BMW 328i key fob battery replacement.
One of the first steps after a failed battery replacement is to double-check the battery itself. Ensure you’ve installed the correct type of battery. For a 2007 BMW 328i key fob, the original battery is often a VL2020 Panasonic. While you mentioned using an ML2020 Panasonic, it’s crucial to verify compatibility. Although both are 2020 models, subtle differences might exist. Use a multimeter to test the new battery voltage; it should read approximately 3V. Even if it appears correct, a faulty new battery isn’t impossible.
Another potential issue arises during the battery replacement process itself. BMW key fobs, particularly older models, can be sensitive. If you followed a guide that involved unsoldering and resoldering, there’s a chance of damaging the internal circuitry if not done carefully. Static discharge or excessive heat can harm delicate components. Even if you were meticulous, microscopic damage might be present. Consider carefully inspecting the circuit board for any visible damage, loose connections, or solder bridges.
If you’ve ruled out battery issues and potential damage during replacement, the problem might be key fob synchronization. Sometimes, after battery changes, the key fob needs to be resynchronized with the car’s system. While less common on older models like the 2007 328i compared to newer BMWs with comfort access, it’s worth trying a basic resynchronization procedure. This typically involves inserting the key into the ignition and turning it to the accessory position (position 1 or 2, without starting the engine) and then pressing and holding the lock or unlock button on the key fob for a few seconds. Refer to your BMW 328i owner’s manual for the precise key synchronization procedure for your model year.
If none of these troubleshooting steps resolve the issue, and your 2007 BMW 328i key fob remains unresponsive for remote functions despite starting the car, a replacement might be necessary. For a 2007 Bmw 328i Key Fob Replacement, you have a few options. A BMW dealership can certainly provide a new key fob, programmed specifically for your vehicle. However, this is often the most expensive route. Alternatively, specialized automotive locksmiths or key fob programming services can offer more cost-effective solutions for a 2007 BMW 328i key fob replacement. They can often program aftermarket key fobs or refurbished original fobs to work with your car. When considering a replacement, ensure the provider can guarantee compatibility and proper programming for your specific 2007 BMW 328i model to avoid further complications.
