AutoCodes – MINI – P0118 MINI

P0118 MINI Code - Engine Coolant Temperature Sensor 1 Circuit High

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 MINI indicates Engine Coolant Temperature Sensor 1 Circuit High.
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.

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Code Popularity 8,521

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0118 MINI Description

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

OBDII Code P0118 MINI - Engine Coolant Temperature Sensor 1 Circuit High - AutoCodes.com — P0118 MINI Code - Engine Coolant Temperature Sensor 1 Circuit High

What does this mean?

What are the Possible Causes of the DTC P0118 MINI?

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 MINI?

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0118 MINI 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.

Need more information about the P0118 MINI code?

Need more information on how to fix the P0118 MINI code? Get Access to Factory Service Manuals

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0118 MINI Code

1. What are common symptoms of the OBDII code P0118 MINI?

The common symptoms of the P0118 code include the engine running hotter than normal, temperature gauge reading high, and the Check Engine Light illuminating on the dashboard.

2. What could cause the OBDII code P0118 MINI to occur?

The code P0118 MINI usually indicates a problem with the Engine Coolant Temperature (ECT) sensor, which may be faulty, damaged, or sending incorrect signals to the engine control module.

3. How does the Engine Coolant Temperature Sensor 1 Circuit High affect vehicle performance?

A faulty ECT sensor can cause the engine to run inefficiently, potentially leading to poor fuel economy, rough idling, and even engine overheating if not addressed promptly.

4. Are there any DIY repair tips for the P0118 MINI trouble code?

DIY repair tips for the P0118 code include checking the ECT sensor wiring for any damage, ensuring proper connections, and replacing the sensor if necessary. It's crucial to follow the manufacturer's recommended procedures.

5. Can driving with the P0118 MINI trouble code cause further damage to the vehicle?

Continuing to drive with the P0118 code may result in engine overheating, which can lead to more severe engine damage if not addressed promptly. It is recommended to address the issue as soon as possible.

6. How can I reset the OBDII code P0118 MINI after repairing the issue?

After repairing the issue causing the P0118 code, you can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes. This will clear the code and reset the Check Engine Light.

7. Is it safe to drive my vehicle with the Check Engine Light on due to the P0118 MINI trouble code?

While it may be safe to drive for a short distance with the Check Engine Light on, it is advisable to address the issue causing the P0118 code as soon as possible to prevent potential engine damage or performance issues.

8. How can I prevent the OBDII code P0118 MINI from recurring in the future?

To prevent the P0118 code from recurring, regular maintenance of the cooling system is essential. This includes checking coolant levels, ensuring proper coolant mixture, and inspecting the ECT sensor periodically for any signs of wear or damage.

9. Can extreme weather conditions affect the Engine Coolant Temperature Sensor 1 Circuit High issue?

Extreme weather conditions can potentially affect the ECT sensor's performance, leading to incorrect temperature readings and triggering the P0118 code. It's important to address any sensor-related issues promptly, especially in extreme temperatures.

10. How crucial is it to address the OBDII code P0118 MINI promptly?

Promptly addressing the P0118 code is crucial to prevent potential engine damage, overheating, and performance issues. Ignoring the code can lead to more significant and costly repairs in the long run.