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Old 03-24-2005, 12:04 PM
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Join Date: Sep 2004
Posts: 14
ASR Light

1992 500SEL with 73k miles. First time ASR light (rectangle, not the triangle with !) went on. No problems with ABS indicator.

Engine was relatively cool.

Immediately noticed loss of power. Was able to maintain highway speed by pressing down on accelerator, but the RPM was up 50% from normal. Letting up on accelerator resulted in a drop of RPM to normal but could not maintain speed on speed on inline without downshift. Put in neutral for brief time with no change in ASR indicator.

Manual states that if ASR lamp goes on and stays on it needs to be checked out by Mercedes dealer. Also it states that there will be a 1/3 power loss.

Drove about 10 miles in this mode (60 mph) and had no problems maintaining traffic speed at higher revs. Stopped and then restarted and car behaved normally.

Recently break light bulb blew. Replaced it. Now other side blew but haven't replaced it. I see in threads that ASR indicator may be associated with a faulty break light switch.

Any suggestion?
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