After putting the Greddy TT in the car, it's running great, but... I get a "Service Engine Soon" light. When I check it out, it's P0128 (Thermostat Function - coolant temperature has not risen even though enough time has passed). So, I figure, no problemo - swap out the thermostat. Same code. OK, so it must be the sensor. I drop in a new sensor. Still, the temperature gauge in the car only goes to about 4 o'clock. Before turbo, it always went to 3 o'clock within five minutes. After swapping both thermostat and sensor, it still won't go to half way and I still get the code. I'm pretty sure the coolant is hot enough because it sure feels hot enough - and the heater works fine.

Any ideas?

 

weird.. I highly doubt anything will ever stay too cool after a turbo. that's weird.. never heard of that..

 

OK, I now have the solution... The dealer (and parts stores) only have one part listed for a replacement thermostat. The part listed is for the 6 MT NOT the 5 AT. The dealer even had my car for 4 hours and couldn't figure out what was wrong. So, I replaced the thermostat and the sensor to the tune of $150 when all I needed was a correct thermostat. I bought an aftermarket thermostat for $35. The Infiniti model was $75.

Here is my evidence:

 

Where did you source the other thermostat?

 

I'm in Victoria BC, I got the part at Esquimalt Auto Parts. These guys will bend over backwards to find stuff for you. 250 386-8877. The part on the invoice says: ALT 154-0708 Therm.

 

I have a after market one made by Murray from Germany . It has no markings on it at all . If any one wants or needs it , I'll take what I paid for it . I ended up not needing it .

EDIT....part number ends in 170...so I would think its a MT thermostat