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The Smart Roadster is a two-door sports car first introduced in 2003 by the German car manufacturer Smart GmbH. Sales of the Roadster and Roadster Coupé met expectations, however warranty claims resulted in a halt of production of both models in November 2005 after 43,091 Smart Roadsters were made. The last one now resides in the Mercedes-Benz Museum.

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P20B1 Faulty Code - 451 2011 Smart Fortwo 62Kw

Vehicle with P20B1 Faulty Code, described as “Reductant Heater Coolant Control Valve Circuit/Open”.

Engine is temperature sometimes is over 212F. What could be the root cause?

Stuck Thermostat?

Thanks in advance.

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Hi @lazarofernandes ,

Don’t know the answer but here’s the service manual for the vehicle that may help.

Click on 2007-2014 Smart Fortwo Second Generation (W451) Service Manual to open the file. Go to p.39 to view a description of how the cooling system works.

Hopefully this is of some help.

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