P1118 Coolant Temperature Sensor Circuit High for Heat Storage System

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: Prius with coolant heat storage

What does P1118 mean on a Toyota?

P1118 — Coolant Temperature Sensor Circuit High for Heat Storage System. This Toyota-enhanced code applies to Prius with coolant heat storage.

Common causes of P1118

Open heat storage sensor circuit
Unplugged sensor connector
Failed sensor reading open
Broken harness wire
Corroded terminals

How to fix P1118

Reseat the sensor connector
Test circuit continuity
Measure sensor resistance
Repair wiring faults
Replace the sensor if the circuit is intact