my car 2002 lexus GS300 check engine light on,i get the code P0128,please help ,do to do with this code? thank you all help

 

I believe that is coolant temp below thermostat regulating temperature.

1. Check coolant level
2. Check Coolant temp sensor ( usually fairly cheap to replace)
3. Replace thermostat ( 20 bucks tops and 10 minutes of your time)
4. replace coolant with fresh stuff.


generally this is a code i commonly see during cold winter months, if happening during summer months just follow the 4 steps above and should go away

ps... your car is a secon gen.

 

can you tell me where is Coolant temp sensor ? thank you

 

if it does happen during the cool winter months what do you suggest? I am in 37F weather at times