SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: COOLANT THERMOSTAT CODE

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Old Mar 29, 2019 | 11:24 PM
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goth's Avatar
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2003 SL 500
COOLANT THERMOSTAT CODE

i have three codes constantly popping up as soon as i go over 60 does anybody know?
i have shown this to a few mechanics they don't think it's the convertors
could it be pressure sensors?





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Last edited by goth; Mar 29, 2019 at 11:30 PM.
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Old Mar 30, 2019 | 01:19 PM
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From: Tremonton, Utah
2014 E350 Sport 4Matic Sedan
I had the same set of messages. Replacing the thermostat cleared up the problem.

Have you watched your coolant temperature to see if it is running low? Low coolant temperature may not be quite as obvious now that the weather is warming up. But I was able to verify that the thermostat was not functioning correctly by watching the coolant temperature, and I noted that it was running lower than it previously had.
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Old Mar 30, 2019 | 11:55 PM
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ray0214's Avatar
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From: Nashville Tn
2011 mercedes sl550, 1995 corvette
Bad thermostat

Your thermostat is probably stuck open, not allowing engine to reach operating temp quickly enough, thus setting the code
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