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  #1  
Old 06-27-2011, 10:34 AM
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Join Date: Sep 2003
Location: Suburban Washington DC
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'94 C280 odometer not storing accumulated mileage

I've just put this car on the road after it's been sitting a few years. I write down the odometer reading when getting gas and put in $10 last week. I know I drove it at least 40 miles this weekend but the odometer reads less then then when I filled up. When driving the mileage does register and goes up. I do disconnect the battery after driving out of habit because it may be weeks before I drive it again but that shouldn't affect the odometer memory. Does the instrument cluster have some internal battery that needs replacing?

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  #2  
Old 06-27-2011, 05:15 PM
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Location: Tucker, Ga USA
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No, just a bad cluster.

Find a good used one with similar mileage
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  #3  
Old 06-27-2011, 05:48 PM
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Going to be hard to find one in the junkyard under 100K like this car.
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Old 06-27-2011, 07:34 PM
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I do not know about MBZ cluster and it would be hard to believe the ODO does not register mileage if the cluster shows speed correctly.

All modern cars use 'drive-by-wire' technology. A sensor in the drive axle generates pulses which is fed to the on-board computer to calculate speed and distance travel. If the car registers speed correctly ( the pulse is converted to an analogue signal to drive the speedo ) then the ODO should go up as expected. The ODO reading is only a counter in the car's computer. Removing the battery has no effect as the counter is stored in non-volatile ram or flash, similar to USB drive.

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