Just a FYI, the temperature gauge isn't an exact readout as the dial shows. You get the same information as an "idiot light", where it only goes higher if the engine is severely hot.
So, I've recently started popping up a random P2181 performance malfunction in cooling system.
It's so random and shows no signs of any other problems that I'm confused. Temp gets hot, stays exactly where it should be, 200. Never gets a tick hotter, or even close to above 200. Air works, heat works fine. No loss of power. It only seems to come on when I really put my foot down.
I've done some searching and seen the Coolant temp sensor for ~36$ from ECS so I plan to replace that and hope it fixes it, but, I've read that improper coolant mixture can also throw this code? And if it was a thermostat sticking, wouldn't it take a long time to heat or overheat?
I really don't want to get into replacing the thermostat and housing as I've seen that they're ~400$ job, and I really don't have that to blow. Thanks in advance.
There are also 2 coolant temp sensors.
2006 Passat 2.0T Tiptronic | Unitronic Stage 1+ | Rokkor Coil Overs | White Line Control Arm Bushings | BFI Tranny Mount | Nuespeed P-Flo Intake | Newsouth Boost Gauge | Rev D Diverter Valve | BSH PCV fix | eBay Climate Knobs | Autotech Exhaust | DDM HIDs | Stereo Upgrades | Bentley Manual | VCDS
2008 Touareg VR6