A little help with a CEL

Hi guys,

I was wondering if I could get a little help figuring out which coolant sensor to buy. I have a 2012 mk6 and yesterday while I was driving it I got a CEL for p0118 and p3081. What I'm trying to figure out is which sensor is "engine coolant temp sensor 1 circuit high". My suspicion is it's the one connected to the waterpump, as I recently had it replaced. But I'm not sure. Any advice?