AutoCodes – Audi – P0118 Audi

P0118 Audi Code - Engine Coolant Temperature 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 Audi indicates Engine Coolant Temperature 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 27,629

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 Audi 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 Audi - Engine Coolant Temperature Circuit High - AutoCodes.com — P0118 Audi Code - Engine Coolant Temperature Circuit High

What does this mean?

What are the Possible Causes of the DTC P0118 Audi?

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 Audi?

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 Audi 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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Need more information on how to fix the P0118 Audi 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 Audi Code

1. What are the common symptoms of OBDII code P0118 in an Audi?

- Common symptoms include the engine running hotter than normal, overheating, dashboard warning lights, and potential issues with the vehicle's fuel efficiency.

2. What could cause the OBDII code P0118 to trigger in an Audi?

- The code P0118 can be triggered by a faulty engine coolant temperature sensor, a problem with the sensor's wiring, low coolant levels, or issues with the cooling system.

3. How can I diagnose the cause of OBDII code P0118 in my Audi?

- To diagnose the issue, you can use a scan tool to read the code, visually inspect the coolant temperature sensor and its wiring, check coolant levels, and test the sensor's resistance.

4. What are the possible repair options for resolving OBDII code P0118 in an Audi?

- Repair options may include replacing the engine coolant temperature sensor, repairing damaged wiring, topping up coolant levels, flushing and refilling the cooling system, or fixing any other related issues.

5. Can I continue driving my Audi with an OBDII code P0118?

- While it may be possible to drive the vehicle with the code triggered, it is not recommended as it can lead to engine overheating and potential damage. It is best to address the issue promptly.

6. How much does it typically cost to repair OBDII code P0118 in an Audi?

- The cost of repair can vary depending on the exact cause of the code and the labor rates in your area. Replacing the coolant temperature sensor, for example, may cost between $100 to $200.

7. Will resetting the OBDII code P0118 in my Audi make it go away permanently?

- Resetting the code may temporarily clear the dashboard warning light, but if the underlying issue is not addressed, the code is likely to reappear once the problem is detected again.

8. Can a DIY enthusiast fix OBDII code P0118 in an Audi at home?

- Depending on the cause of the code, some DIY enthusiasts may be able to address the issue at home by replacing the sensor, checking wiring, or topping up coolant levels. However, more complex issues may require professional help.

9. How urgent is it to address OBDII code P0118 in an Audi?

- It is important to address the code promptly to prevent potential engine overheating and damage. Ignoring the issue can lead to more costly repairs down the line.

10. Are there any maintenance tips to prevent OBDII code P0118 in an Audi?

- Regularly checking coolant levels, inspecting the cooling system for leaks, and maintaining the vehicle according to the manufacturer's recommendations can help prevent issues that trigger the code P0118.