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Fault code P2081 - which sensor to replace

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I have a 2014 Mercedes GLK250 with OM651 diesel engine. P2081 comes up once in a while. Which sensor does this code come from? There are 2 exhaust temperature sensors. One upstream of the turbo and the other inside the DPF. Which one should I check? Thanks.

Vehicle: 2014 Mercedes GLK250 2.1 L

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