FromV4_to_C63

Note sure what caused it , aside the weather being 100+ then the next Day 60+
Should I clear it or take the Car in

superswiss

Take the car in. This might be related to your earlier CEL. P0128 means your engine isn't reaching operating temperature as it should. Could be the thermostat stuck open or opening prematurely or your coolant temperature sensor not working.

FromV4_to_C63

Making Apt now.

FromV4_to_C63

Apt for next Monday
However after a full tank of Gas the CEL has gone out

SJGetsome

What are you using to read and clear codes? I need to get something for that purpose.

FromV4_to_C63

I did not clear the code, it cleared after a Full tank of GAS.

I purchased a

These scanners dont seem to be that accurate

Veepeak Mini WiFi OBD2 Scanner

Jimmy_c63s

Harmless. Happens occasionally when temperature drops and it's very cold the next day and you start the car and take off immediately.

Stock or tuned?

FromV4_to_C63

Stock

On a Hot day , say 100+ what is a normal Transmission Temp
My Coupe was hovering around 180 - 195

superswiss

Yeah, that's normal. I was at 194 after a lap around the Nurburgring for example. It's in that neighborhood. As long as the temperature is indicated in white, it's within normal operating range. Blue is too cold, and red is too hot.

FromV4_to_C63

Got it.

FromV4_to_C63

Dealer ran a DIAG, its a bad Thermostat.
MBENZ will Replace next week.

Until then I'm in a Loaner GLE 300

FromV4_to_C63

Thermostat will be replaced under warranty
Cant even say I am mad at this point , stuff happens.

Jimmy_c63s

That's a bummer. At least it's got warranty but man your car is still basically brand new.