insufficient coolant temp for closed loop fuel control. What parts do I need to fix this?

 

None until after you've finished diagnosing it.





Have you tested the sensor? Have you checked the wiring from the sensor to the PCM? Have you checked the coolant temp &/or level? Is your heater core leaking? Or your intake manifold?

 

Could also be that your thermostat is stuck open.

http://www.samarins.com/glossary/thermostat.html

What does your temp gauge on the instrument panel look like after it has had time to warm up? Does it look lower than normal? Does it move at all?

 

Could be that you didn't warm the engine to operating temp before running the KOER test.

Steve

 

I live in Alaska, and it was a 140 degree thermostat from the lower 48 when I needed a 190 degree thermostat, now it's fine... thank you for your help, it was greatly appreciated.