well for about ten minutes. I was replacing my 02 sensor today on my 420sel and I noticed some things disconnected so i plugged them back in as I thought I remembered the alarm system being down there.I tried it out and it honked and flashed like it should so all was well. Later i drove it across town to show my girlfriend and it worked then too. As soon as I left, it kept going off when I drove down the street. After about four bouts of that and a quarter a mile down the road, I pulled over and disconnected it right there. Too bad.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual

I found mine was disconnected too while I was changing my O2. Just added it to my to do list. I found a receipt the PO had paid someone to do it. And I thought because an aftermarket keyless remote system was added the factory alarm was disconnected.

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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When I got my 420SEL a couple of years ago -- in mint condition overall, I found that the alarm system was touchy and would go off in a high wind in the parking lot!! I just went under the right floorboard and disconnected both alarm cables, which stopped the problem. I think alarms are often more problems than they are worth anyway. Ben Carter

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Ben Harrison Carter
1999 Mercedes ML320 87K
1992 Mercedes 300CE 89K
1995 Corvette 29K -- Sold Dec 09
1989 Mercedes 420SEL 99K -- (Sold 4/08)
1968 Mercedes 230S (106K) (Sold 9/06))
1976 Mercedes 450SEL 130K (Just sold - 06)
1961 Mercedes 220Sb (sold years ago)

yeah it definitly sucked having to pull over and get out and disarm it front of a crowd of snootie starbucks drinkers. No offence to starbucks fans.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual