P0118 means engine coolant temperature circuit high. The coolant temp sensor circuit reads high — usually an open circuit making the computer think the engine is extremely c
Drive gently and get it diagnosed within days.
The coolant temp sensor circuit reads high — usually an open circuit making the computer think the engine is extremely cold (or hot, depending on design). Can cause hard starting and rich running.
Most common.
Broken wire.
Coolant wicking into the connector.
Sensor exposed to air reads wrong.
Related cooling issue.
Typically $50–$300
Sensor replacement typically $100–$300; coolant top-off $20–$50. Estimates vary by vehicle. Costs are estimates and vary by vehicle, location, and shop.
Check your coolant level now — low coolant is both a cause and a danger. If coolant is full, it's a sensor issue; drive gently until fixed.
Typically $50–$300. Sensor replacement typically $100–$300; coolant top-off $20–$50. Estimates vary by vehicle.
Drive gently and get it diagnosed within days.
The most common cause is failed coolant temp sensor. Most common.