P0125

[ChicagoGSX]

On the way home my CEL came on and I checked it my pocketlogger which shows it as being Insufficient Coolant Temp. for Closed Loop Fuel Control. I know the thermostat is good because the car warms up quickly. I searched and it seems some people said that it could be the front O2 sensor, which would make sense because for the past month my gas mileage has been pretty bad (14-16 mpg). Anyone know any other causes?

 

[WiserTSi]

I don't know if this would be much help but I just had the same code come up the other day. I have a bad O2 sensor, you should see no or odd ready with your pocket logger. I also got another code which was fuel trim(bank one). I haven't got the new o2 in yet so I don't know if that going to fix it or not but lets hope so.

 

[crazyjoe]

Getting the new o2 sensor should fix both codes. Did for me.