P0118 - How To Repair: Meaning, Causes, Symptoms, Fixes

P0118 - OBD2 Trouble Code Engine Coolant Temperature Sensor Circuit High

Identical faults

The following faults are identical to P0118. For these, you can follow the information on this page:

P0117 – Engine Coolant Temperature Sensor 1 Circuit Low

P0118 Code Definition

Engine Coolant Temperature Sensor 1 Circuit High

What Does the Engine Code P0118 Mean?

Character "P" in the first position of Diagnostic Trouble Code (DTC) represents the powertrain system (engine and transmission), "0" in the second position means that this is a generic OBD-II (OBD2) DTC. "1" in the third character position in a DTC indicates that the fuel and air metering and auxiliary emission controls is experiencing a malfunction. The last two characters "18" is DTC number. OBD2 Diagnostic Trouble Code P0118 means that Engine Coolant Temperature Sensor Circuit High has been detected.

Carly's expert mechanics have identified the following related fault codes. With the information for these fault codes it is often possible to identify and better repair your faulty part/system:


    Carly Universal Scanner

    Carly Adapter
      iOS and Android enabled
      All car brands supported
      14-day money-back guarantee on the scanner
      Lifetime warranty with premium customer support
    Buy now

    What Is the Cause of P0118?

    There can be several damages/failures causing the underlying problem of the OBD2 DTC P0118. To find the root cause of P0118, unlock the “Smart Mechanic" feature in the Carly app.

    What Are the Symptoms of the Code P0118?

    Symptoms of a fault in the exhaust gas recirculation

      Illumination of the motor control lamp

      Check-Control message in the instrument cluster

      Vehicle may take longer to reach operating temperature

      Possible overheating of the motor with the radiator shutter closed

    Diagnostic background image

    How much does it cost to diagnose P0118?

    Visiting a car repair shop and letting them perform a diagnostics check can cost you $60-$100. For almost the same price you can get Carly. Its advanced features can cover what a professional automotive scanner that costs over $3,000 would, and more!

    Carly OBD2 Scanner

    How To Diagnose and Clear the Code P0118?

    Performing a diagnostics check with a diagnostic scanner helps you identify a particular problem area that is outside the normal range and shows where a fault might be occurring. This helps you to detect errors before they cause more damage to your vehicle. In comparison to generic OBD devices that only provide OBD-level engine-related data, Carly can run advanced manufacturer-level diagnostics, check all your ECUs in your car (like ABS, airbag, multimedia) and get deeper insights. You can find additional information about the trouble code and understand the severity of the problem. With the new Smart Mechanic feature, you get additional professional insights and tips from expert mechanics. You are able to check components and their mechanics, find detailed repair tips, and learn about potential future damage. After you have fixed the problem you can easily clear the fault codes with Carly, too. Also, the diagnostic results are safely stored inside the app or as convenient PDF reports you can share with your friends or a mechanic.

    Common Mistakes when diagnosing the P0118 code

    The most common mistake is to look and try to fix each individual OBD2 (OBD-II) code without having a holistic understanding and approach. Understanding the interrelationship of different systems is crucial to determining the root cause of the problem and finding the right solution. The new Carly Smart Mechanic feature provides a look at the whole system, not just one individual code. Enable Smart Mechanic in your Carly app and get a holistic solution-focused approach when diagnosing the code P0118.

    How Serious Is the Code P0118?

    For now, this issue is not serious. Carly recommends you to check this issue on a regular basis and check if it gets worse later on.

    How to fix the P0118 Code

    P0118 is a generic fault code but the repair steps may vary depending on the root cause and the make/model of your vehicle. Get the Smart Mechanic in your Carly app to learn more and receive guidance.

    Blurry background image
    Mobile and adapter showcase

    Estimated Cost of Repair for the P0118 Code

    The cost very much depends on the root cause of the issue. To find more information about causes, possible solutions, and potential repair costs, unlock “Smart Mechanic" content on the Carly app.

    Get Carly Now

    Learn more about the P0118 Code

    Function radiator blind

    The air damper control regulates the air supply for the engine and unit cooling (mounting parts) by opening the radiator blind only when required. Up to 2 radiator blinds can be installed in the front of the car. Due to the available installation space, the motorization and the motor control, the following versions are available for the air flap control.

    Variants of the air flap control

      passive air flap control via electromagnet

      Active air flap control via actuator (radiator blind drive)

      active and passive air flap control (electrical drive for the upper radiator blind and electromagnet for the lower radiator blind)

    Further information on air flap control

    Due to the installation space required in some models the active air flap control cannot be combined with certain optional equipment (e.g. sports package, active steering or active cruise control). The passive air flap control for the lower radiator blind cannot be done on some models with turbocharging. The radiator blind drive with integrated control electronics is a servomotor. The radiator blind drive is connected to an adjustment mechanism. The individual slats of the radiator blind are moved into the respective position via the adjustment mechanism.

    *Every car is unique. The Carly Features that your car supports depend on the model, build year, hardware, and software in the car. Plug the scanner in the OBD2 port, connect to the app, run your first diagnostics, and check which features are available for your car. Also, keep in mind that any information provided on this website is for informational purposes only and should be used at your own risk. Mycarly.com is not responsible for any errors or omissions, or for the results stemming from the use of this information.

    Code list background

    Top 10: The most common OBD2 trouble codes

    Car Brands
    • BMW
    • Mini
    • Volkswagen
    • Audi
    • Seat
    • Skoda
    • Mercedes
    • Porsche
    • Renault
    • Toyota
    • Lexus
    • Ford

    Our Partners

    Inside of EU
    Outside of EU(priority shipping)

    Our payment methods

    (Depends on your country)

    Our advantages

    • Secure payment
    • Lifetime warranty on the Carly Scanner
    © 2023 Carly Solutions GmbH & Co. KG. All rights reserved