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What color is the program button on your door opener?
If it's a round yellow button, it uses the newer SECURITY+2.0 coding. It came out around 2011.
The Homelink system in the Z4 uses the older 315 MHz security system. And BMW didn't update the system at all, so I have the same issue with my 2016 Z4.
The solution is a Homelink Repeater. It's a unit you plug in your garage. You program the Z4 to it and the Repeater to your opener. Bit of a nuisance, but it works.
Gerry
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2023 Z4 ///M40i Thundernight Metallic/Cognac Vernasca/Moonlight/Shadowline/19" Black 799M/PP/DAP/ACC/HK
2022 X5 xDrive40i Phytonic Blue/Cognac Vernasca/DAPP/LSP/PP/CCP/PAP/20" Style 738/Spare Tire/Trailer Hitch
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