woke up this morning 30 degrees in Houston,Tx car turned over one start but was hard yesterday was 75 degrees so as I warm up the car check engine throws a light go to auto zone code p0125 did the research on forum and found out what it was well I am not getting bad gas milage or is sge running richI rode arond Houston all day went 135 miles and used alittle over a quarter tank of gas temp gauge is working fine so auto zone reset the computer and found no codes usaully when you reset the engine light the code is still stored could be of very unsual Tx weather

 

Your coolant temp sensor is not showing the proper temp and this cause your ECU to stay in it's cold start up mode called "Open Loop".

 

if the ECU is getting a false low reading from the coolant temp sensor and staying in cold start up mode isnt that 'open loop'?

 

thanks alot disco mike

 

Thanks for catching that, second goof in a couple days.