Temp. Sensor - Page 2 - PeachParts Mercedes-Benz Forum

thayer · #16 02-09-2009, 06:53 PM

how hard would it be to add one to a 83 126?

emerydc8 · #17 01-19-2010, 08:47 PM

Quote:

I would definitely test it with a resistor. Go to radio shack or other electronics parts store and get a 3k or 3.3k ohm resistor. Unplug the sensor and put the resistor across the two leads. Turn the key to the on position and look at the gauge. It should read ~70F (25C) constantly (no fluctuations)

If it does, then the sensor is the problem. If it doesn't (and still reads +20 degrees) then its likely the display/electronics contained there.

Tried the 3.3K Ohm resistor and nothing on the display with the car running. Anyone know where I can find an LED display?

lafooy · #18 01-22-2010, 02:05 AM

found some on ebay by searching w124 display. Be careful with part number and year of car though

emerydc8 · #19 01-22-2010, 04:51 AM

Thanks. I found two on e-bay with the same part number (124 542 01 05), but the MB EPC shows a different part number for my car (A 000 542 72 27). One was $25 and the other $36. Maybe I should check the dealer and see what their price is too. It would put the risk on them if they gave me the wrong part.

babymog · #20 01-22-2010, 10:34 AM

You need the 5-pin display, the extra pin is a speed sense input. All of the 5-pin 124 displays will fit/work on your car.

Oh, and go ahead on the dealer thing, the price that I was quoted was IIRC $390 for a 126 temp-display unit. Used makes some sense here.

emerydc8 · #21 01-22-2010, 09:09 PM

Thanks.