Date registered: May 2007
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Hi Andrew, I have a 2000 E240 that has exactly the same symptoms. Randomly the hazards flash at double speed either when I lock it or sometime after. I keep coming back to it with the lights flashing - so dont want to leave it at the airport for 2 weeks!
The siren unit has been called out to me as well, havent managed to take a look yet as I dont want to be out in the cold, tried looking at the pneumatic locking unit under rear seat and that was fine. Like you Im really worried that the alarm is going to go off and that I wont be able to stop it.
Sorry I cant offer a fix, but its somehow reassuring to know someone else has the same fault.
This weekend looks warmer so may have a go at taking that wheelarch liner out....
Other than that - this has been a very reliable car over 10 yrs. Still feels solid and bullet proof, the REAL issue is the rust which is bursting out everywhere - even in the middle of doors