Trying to resolve the last of my DCTs: P0118. Trust me when I tell you I searched for other examples, but there are only a few random references to it with very little amplifying information.
A local mechanic suggested it was a faulty thermostat but then Scott (KLR3CYL) said it was most likely the sensor, and he knows a MST more about fixing these cars than most Honda service techs so I bought a new sensor. The swap looks hilariously easy in the service manual, so I figured 10 or 15 minutes and it would be done. Perhaps for Scott, sure, but for weekend warriors like me, not so much. If you end up with this same DCT, I'm hoping this post will save you a little time/effort.
I'm not going to admit to how much time I spent just trying to find where it's located on the engine, but after figuring out how to interpret the stick drawings in the service manual, I eventually found it. To test the theory, I unplugged the connector and snapped it on the new sensor and whaddya know.... no more P0118! Now to remove the old one and install the new so the sensor sends the correct values to the ECM.
My 19mm 1/2 drive impact socket fits the new sensor but it's too bulky to fit where the sensor lives. Off to find a thin-wall 3/8 drive socket and get this done.

A local mechanic suggested it was a faulty thermostat but then Scott (KLR3CYL) said it was most likely the sensor, and he knows a MST more about fixing these cars than most Honda service techs so I bought a new sensor. The swap looks hilariously easy in the service manual, so I figured 10 or 15 minutes and it would be done. Perhaps for Scott, sure, but for weekend warriors like me, not so much. If you end up with this same DCT, I'm hoping this post will save you a little time/effort.

I'm not going to admit to how much time I spent just trying to find where it's located on the engine, but after figuring out how to interpret the stick drawings in the service manual, I eventually found it. To test the theory, I unplugged the connector and snapped it on the new sensor and whaddya know.... no more P0118! Now to remove the old one and install the new so the sensor sends the correct values to the ECM.

My 19mm 1/2 drive impact socket fits the new sensor but it's too bulky to fit where the sensor lives. Off to find a thin-wall 3/8 drive socket and get this done.