Check engine light P0128 S550 4-matic
10-15-2012, 09:27 AM
#1
Check engine light P0128 S550 4-matic
"Coolant temperature operating temp too low" Coolant level is fine. Cleared code and came back within 200 miles.. Cant seem to figure this one out.. any one know?
02-05-2015, 01:04 PM
#2
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Location: Roseville, Ca
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01 ML55 / 97 E320/01 CLK55/ 2010 S550
Mine just started to do it on my 2010 S550, I haven't had a chance to check it. Have you got yours fixed yet? if so was it the thermostat or sensor?
