Hello, I have just bought a 2006 TSX got it with the "check emission system" light on. I let them scan it for me it says that the coolant temperature sensor is having problem when I check I saw that there was no wire attach to the coolant sensor. I was searching for it in the engine bay but can't seem to find it.
Can anyone help with the location or harness that it's suppose to be on?

 

had that issue too, dealer fixed it , there is wiring to find as they had to reconnect the wires.

 

The problem is that in my country we don't have an Acura dealer we only have a Honda dealer and they don't work on Acura cause they say it was not bought from them.

 

That is an easy location. I replaced my Coolant sensor not long ago.
There are 2 I believe but the one most problematic, the wires tend to corrode, is on the Radiator - front left, lower side.

If you look under the car you will see a hole in the rock guard and see the Radiator Coolant drain valve. That is not it, but it is in that location

The wires should be guided with a plastic guard coming from the engine bay. I did not have to replace the harness, just my sensor prongs corroded, so I'm not sure where the whole harness is located farther into the engine.

It was an easy fix for the sensor. I did replace my coolant but I don't think you have to as the back pressure should create enough suction to prevent all but a small amount of coolant drip.

 

I will take it to a garage tomorrow so that they can have a look for me and try to find it.
Will let you guys know how it went.