P0118 1999 Honda Civic Code - Engine Coolant Temperature Sensor 1 Circuit High Voltage
Quick Answer
The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. Common causes include Low Engine Coolant Level, Faulty Engine Coolant Temperature (ECT) sensor, Faulty Engine Coolant Thermostat. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0118 1999 Honda Civic indicates Engine Coolant Temperature Sensor 1 Circuit High Voltage.
- Common causes
- Common causes include Low Engine Coolant Level, Faulty Engine Coolant Temperature (ECT) sensor, Faulty Engine Coolant Thermostat.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0118 1999 Honda Civic Description
What are the Possible Causes of the DTC P0118 1999 Honda Civic?
- Low Engine Coolant Level
- Faulty Engine Coolant Temperature (ECT) sensor
- Faulty Engine Coolant Thermostat
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
How to Fix the DTC P0118 1999 Honda Civic?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0118 1999 Honda Civic code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0118 1999 Honda Civic Code
1. What does the OBDII code P0118 mean on a 1999 Honda Civic?
P0118 indicates a high voltage issue in the Engine Coolant Temperature (ECT) Sensor 1 circuit, suggesting the sensor is sending an abnormally high signal to the engine control module (ECM).
2. What are the common symptoms of code P0118 in a 1999 Honda Civic?
Symptoms may include poor fuel economy, difficulty starting the engine, a rough idle, overheating, or the cooling fan running continuously.
3. What causes the P0118 code to appear on a 1999 Honda Civic?
Common causes include a faulty ECT sensor, damaged or corroded wiring, a bad ECM, or a poor connection in the sensor circuit.
4. Can I drive my 1999 Honda Civic with the P0118 code?
While the car may still be drivable, it’s not recommended, as the engine could overheat or run inefficiently, potentially causing further damage.
5. How do I fix the P0118 code on my 1999 Honda Civic?
Start by checking and repairing any damaged wires or connectors to the ECT sensor. If the issue persists, replace the ECT sensor.
6. How do I test the Engine Coolant Temperature sensor in a 1999 Honda Civic?
Use a multimeter to measure the sensor's resistance. Compare the readings to the manufacturer’s specifications for accuracy.
7. Where is the ECT sensor located on a 1999 Honda Civic?
The ECT sensor is typically located near the thermostat housing on the engine.
8. Can a faulty thermostat cause the P0118 code to appear?
While unlikely, a stuck thermostat could indirectly cause overheating, but the P0118 code is more directly related to the sensor or its circuit.
9. How much does it cost to repair a P0118 code on a 1999 Honda Civic?
Replacing the ECT sensor typically costs between $50 and $150, including parts and labor, though costs may vary by location and repair shop.
10. Will clearing the P0118 code fix the problem on my 1999 Honda Civic?
Clearing the code will remove it temporarily, but if the underlying issue isn’t resolved, the code will return.
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