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Q: Changed my coolant temperature sensor 24 hr ago on 2002 Volkswagen Passat

My temp. needle gauge would stay at 90. When i ran the diagnostic i got a code p1296 so i assumed it was the coolant sensor because i have no symptom that i have a bad thermostat. I have hot heat,car does not overheat, mileage same. I changed the sensor 24 hr ago after my needle gauge started working right, but today i notice the check engine light still does this mean its the thermostat ? If not what else could it be ?
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In addition, it is going to take awhile and a few start ups for the light to go out! You coud just get a repair shop or someone with a code reader to turn it off. If it comes back on with the same code, check the wires and connector to the sensor. You said the temp gauge is ok now so just have the light turned off.
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