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It seems like you have two separate issues here. The first being the engine swap and the second being a potential problem with the temperature sensor.
For the engine swap, the M273 engine used in the 2011 GL450 is also found in other Mercedes-Benz models such as the E-Class, S-Class, and CL-Class. However, it's important to note that even within the same engine family, there can be differences in the way the engine is mounted, the accessories it uses, and the electronic control systems. It's best to consult with a qualified mechanic or dealership to determine which engines would be compatible with your specific vehicle.
As for the temperature sensor issue, if your temperature gauge is working properly, but you're still getting a code related to the coolant temperature sensor, it could be a wiring or connector issue rather than a problem with the sensor itself. I recommend having a professional mechanic diagnose and address this issue to ensure it's properly resolved.
In both cases, it's important to seek professional advice to ensure the best course of action for your vehicle.
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