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Engine-Codes – BMW – P0118 BMW

P0118 BMW Code - Engine Coolant Temperature Sensor 1 Circuit High

Quick Answer

The P0118 BMW code indicates a problem with the Engine Coolant Temperature Sensor 1 Circuit High. Common causes include Faulty coolant temperature sensor: The sensor itself may be malfunctioning, sending incorrect readings to the ECM, Wiring issues: Damaged or corroded wiring connecting the sensor to the ECM can cause circuit high readings, ECM malfunction: A problem with the engine control module can also trigger this code. 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 BMW indicates Engine Coolant Temperature Sensor 1 Circuit High.
Common causes
Common causes include Faulty coolant temperature sensor: The sensor itself may be malfunctioning, sending incorrect readings to the ECM, Wiring issues: Damaged or corroded wiring connecting the sensor to the ECM can cause circuit high readings, ECM malfunction: A problem with the engine control module can also trigger this code.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P0118 BMW Description

The P0118 BMW code indicates a problem with the Engine Coolant Temperature Sensor 1 Circuit High. This sensor is responsible for monitoring the temperature of the engine coolant and sending this information to the engine control module (ECM). When the ECM detects that the signal from the coolant temperature sensor is higher than normal, it triggers this diagnostic trouble code.

OBDII Code P0118 BMW - Engine Coolant Temperature Sensor 1 Circuit High
P0118 BMW Code - Engine Coolant Temperature Sensor 1 Circuit High

Common Causes of P0118 BMW

  1. Faulty coolant temperature sensor: The sensor itself may be malfunctioning, sending incorrect readings to the ECM.
  2. Wiring issues: Damaged or corroded wiring connecting the sensor to the ECM can cause circuit high readings.
  3. ECM malfunction: A problem with the engine control module can also trigger this code.
  4. Coolant level: Low coolant levels may affect the sensor's ability to accurately measure the temperature.

Symptoms of P0118 BMW

  1. Engine overheating: A faulty coolant temperature sensor may send incorrect readings to the ECM, causing the engine to overheat.
  2. Poor fuel economy: Incorrect temperature readings can result in the engine running too rich or too lean, leading to decreased fuel efficiency.
  3. Rough idling: The engine may experience rough idling or stalling due to inaccurate temperature data affecting the fuel mixture.
  4. Check Engine Light: The illumination of the Check Engine Light is a common symptom associated with this code.

How to Fix P0118 BMW

  1. Diagnostic: Begin by using an OBD-II scanner to retrieve the trouble code and further diagnose the issue.
  2. Inspect sensor and wiring: Check the coolant temperature sensor and its wiring for any signs of damage or corrosion.
  3. Replace sensor: If the sensor is faulty, replace it with a new one and ensure proper installation.
  4. Clear codes: After replacing the sensor, clear the trouble codes using the OBD-II scanner.
  5. Test drive: Test drive the vehicle to ensure that the issue has been resolved and the Check Engine Light does not reappear.

Cost to Fix P0118 BMW

The cost of repairing a P0118 BMW code can vary depending on the specific cause of the issue. On average, the cost of replacing a coolant temperature sensor ranges from $50 to $150. Additional costs for labor and diagnostic fees may bring the total repair cost to around $150 to $300. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

When is the Code Detected?

An excessively high voltage from the sensor is sent to ECM.

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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 BMW Code

1. What are the common symptoms of OBDII code P0118 in a BMW?

The common symptoms of OBDII code P0118 in a BMW include engine overheating, poor fuel economy, rough idling, and the check engine light illuminating on the dashboard.

2. What does the OBDII code P0118 indicate in a BMW?

OBDII code P0118 in a BMW indicates a problem with the Engine Coolant Temperature Sensor 1 Circuit reading a high voltage signal, which can affect the engine's performance.

3. What are the possible causes of OBDII code P0118 in a BMW?

Possible causes of OBDII code P0118 in a BMW include a faulty engine coolant temperature sensor, a malfunctioning thermostat, wiring issues, or a problem with the engine control module.

4. How can I diagnose the issue related to OBDII code P0118 in my BMW?

To diagnose the issue related to OBDII code P0118 in your BMW, you can use an OBDII scanner to retrieve the code and then test the engine coolant temperature sensor, check the wiring for any damage, and inspect the thermostat for proper functioning.

5. Can driving with OBDII code P0118 in a BMW cause further damage?

Continuing to drive with OBDII code P0118 in a BMW can potentially cause damage to the engine due to incorrect temperature readings, leading to overheating and other related issues. It is recommended to address the problem promptly.

6. How can I repair OBDII code P0118 in my BMW?

To repair OBDII code P0118 in your BMW, you may need to replace the engine coolant temperature sensor, fix any wiring issues, replace a faulty thermostat, or reset the engine control module to clear the code.

7. Is it safe to reset the OBDII code P0118 in a BMW without fixing the underlying issue?

It is not recommended to simply reset the OBDII code P0118 in a BMW without fixing the underlying issue, as the problem will likely reoccur, potentially leading to engine damage and safety concerns while driving.

8. Can a DIY enthusiast fix OBDII code P0118 in a BMW?

Depending on the DIY enthusiast's skill level and access to tools, it is possible to fix OBDII code P0118 in a BMW by following proper diagnostic procedures, replacing components as needed, and clearing the code with an OBDII scanner.

9. How much does it cost to repair OBDII code P0118 in a BMW at a dealership or mechanic?

The cost to repair OBDII code P0118 in a BMW at a dealership or mechanic can vary depending on the specific issue, parts needed, labor costs, and location, but it typically ranges from $100 to $300 or more.

10. Can OBDII code P0118 in a BMW be prevented?

Regular maintenance, such as checking and replacing the engine coolant temperature sensor as recommended by the manufacturer, can help prevent OBDII code P0118 in a BMW. Additionally, addressing any cooling system issues promptly can reduce the risk of this code appearing.

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