2007 Nissan P0118: What It Means & Is It Safe to Drive?
P0118 on the 2007 Nissan: Engine Coolant Temperature Circuit High Input. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
What this code means
The engine coolant temperature (ECT) sensor is reporting a voltage signal that is too high, which the PCM interprets as an extremely cold or open-circuit condition. This is opposite to P0117 (low input) and often means the sensor or its wiring has failed open.
Common causes on the 2007 Nissan
- Failed engine coolant temperature sensor
- Open circuit in ECT sensor wiring
- Corroded or damaged sensor connector
- Low coolant level exposing the sensor
Symptoms
- Check Engine Light
- Engine runs rich (PCM thinks it is always cold)
- Poor fuel economy
- Hard starting when warm
Typical fixes
- Replace engine coolant temperature sensor
- Inspect and repair wiring and connector
- Check coolant level
Repair cost range
For a 2007 Nissan, repairs for P0118 typically fall between $50 and $200, depending on the root cause and labor rates in your area.
Known issues on Nissan
Nissan P0118 on QR25 and VQ35 engines is typically a failed ECT sensor. The sensor is on the engine block or thermostat housing depending on the model. Inspect connector pins for green oxidation—a common Nissan wiring issue in humid climates.
Most commonly affected models