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Generally speaking, if you have engine oil in the cooling system, you have a leak somewhere in the engine, which could be a head gasket. Is there any sign of coolant in the engine oil ?
first check radiator level if it is full and the heater is working good make sure temp gauge is functioning c orrectly it is most likely the coolant temp sensor but if this is a high milage vehicle and you have owned long time and never changed i would also replace thermostat and check plug to temp sensor forr good conections and good wires
CODE 15 - Engine Coolant Temperature (ECT) Sensor Circuit (Low Temp.) It's no surprise that your mileage was affected, damage to the ECT sensor will affect proper operation of the fuel injection system. REMOVAL
Relieve engine coolant system pressure.
Turn ignition to "OFF".
Disconnect electrical connector.
Carefully back out ECT sensor.
INSTALLATION
Coat threads (only) with sealer.
Install sensor in engine, torque to 30 N-m (22 lb.ft.).
Hi:
Your coolant temp sensor was not reading right, and is a sensor that adjusts your eng timing. I would keep an eye on your coolant level. That would be a bigger concern, figuring out if you have a leak. If the cold comes back, you need to change out the coolant temp sensor.
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