Peugeot 508 Anti-Theft Alarm Issue

Hey, that sounds frustrating! I had a similar issue with my old Opel Astra. The alarm would just randomly go off in the middle of the night. Did you try checking the battery? A weak battery can sometimes cause weird electrical issues with the alarm system.

Thanks for the suggestion! I hadn't considered the battery. Was your Opel's issue also related to a stored error code? Did the alarm stop working altogether, or was it just triggering randomly?

Yeah, there was an error code about low voltage from the alarm module. The alarm was mostly going off randomly, but sometimes it wouldn't arm at all. I'd say it's worth getting the battery checked, but if that's not it, you might need to take it to a workshop to have the alarm system diagnosed properly.

Took it to a local workshop, and you were right, it was something strange. The alarm was coded to activate the optical locking (indicators) as the likely cause. They recoded it, and now it works perfectly. The repair cost me 45€. Thanks for your help!