P1116 LEXUS Coolant Temperature Sensor Circuit Stack for Coolant Heat Storage System

Possible causes

– Faulty Engine Coolant Temperature (ECT) sensor for HST
– Low engine coolant level
– Engine Coolant Temperature (ECT) sensor for HST harness is open or shorted
– Engine Coolant Temperature (ECT) sensor for HST electrical circuit poor connection
– Faulty engine coolant thermostat

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)