dennisroth10

Mercedes E Klasse alarm malfunction

My 2009 Mercedes E Klasse with a diesel engine has a weird issue. It has about 61670 km. The anti-theft alarm system is acting up. There's an error stored, and the alarm doesn't work at all. Could this be because the alarm is coded to use the indicators for locking, or is something else going on?

4 comment(s)

That's a strange one. Have you checked the car battery lately? A weak battery can mess with the electrics, including the alarm. Also, any signs of water getting in near the alarm sensor?

Thanks for the quick reply. The battery seems fine when tested. I don't see any water. Could a bad alarm sensor cause this? Or is there a common thing that breaks that I should know about?

A bad sensor is possible, but not as likely. With the error and the alarm not working, it needs a closer look. Could the optical locking coding be the problem? Maybe, but not likely by itself. Take it to a workshop to get it scanned with a good tool. They can find the exact error code and figure it out from there.

Thanks for the advice. I took it to a workshop, and the error was about the alarm's settings, like you thought, with the optical locking. They tweaked the system, and it cost 45€. It's working now. Thanks again.

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