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Check Engine Light came on recently, code is P0128. It says that Coolant temperature is below Thermostat Regulating temperature. I went to OEMBimmerParts.com to buy a Thermostat replacement. However, I got two options on the site.

Cooling Thermostat OEM 11537549476

Auto Transmission Cooler Thermostat OEM 17217559962

I'm not sure of the difference between the two and which I would need.
I have provided pictures below.
 

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It would help if you post more information. Yr ,model , Eng .. then go to realoem and get the correct part numeber for your thermostat.

It's the first picture for engine coolant . Second is a transmission cooler. .
 
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