P0119 Engine Coolant Temperature Circuit Intermittent

Introduction to P0119 Error Code

What is P0119 Error Code?

The P0119 error code is a specific diagnostic trouble code (DTC) that signals an intermittent issue with your engine coolant temperature (ECT) sensor circuit. It’s a crucial part of your vehicle’s engine management system, providing vital data to keep your car running smoothly.

Importance of the Engine Coolant Temperature Sensor

The ECT sensor is a critical component in modern vehicles. It monitors the temperature of the engine coolant, which helps the engine control unit (ECU) to optimize fuel consumption, engine performance, and emissions. The sensor is critical to prevent overheating and engine damage.

Understanding the P0119 Error Code

Symptoms of P0119 Error Code

So, how do you know if you’re facing a P0119 error? Several tell-tale signs indicate this specific issue: erratic temperature gauge readings, poor fuel economy, engine overheating, and in some cases, the check engine light may come on.

Causes of P0119 Error Code

The P0119 error code can be triggered by various issues, such as a faulty ECT sensor, poor electrical connections within the circuit, corrosion, or a damaged engine control module (ECM).

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Risks of Ignoring P0119 Error Code

Ignoring the P0119 error code can lead to severe problems down the line. The ECU might receive incorrect temperature readings, leading to suboptimal engine performance or even severe engine damage due to overheating.

How to Diagnose P0119 Error Code

Diagnostic Equipment

To diagnose a P0119 error code, you’ll need an OBD-II scanner. This tool can read the fault codes from your vehicle’s ECU and provide valuable information for your diagnostic process.

Diagnostic Steps

When diagnosing the P0119 error code, start by scanning the vehicle with your OBD-II scanner. Then, visually inspect the ECT sensor and its wiring. Check for any signs of damage, corrosion, or loose connections.

How to Fix P0119 Error Code

Possible Fixes

Fixing the P0119 error code can involve a few different steps, depending on the cause. This might include replacing the ECT sensor, repairing or replacing damaged wiring, or even replacing the ECM if necessary.

When to Involve a Professional

While some fixes can be done by a competent DIYer, it’s crucial to involve a professional mechanic if you’re unsure or

if the problem persists after your initial repairs. Professional mechanics have the necessary experience and tools to accurately diagnose and fix such complex issues.

Preventive Measures for P0119 Error Code

Regular Maintenance

To prevent a P0119 error code, regular maintenance is key. This includes regular checks and cleaning of the ECT sensor and the electrical system to ensure all connections are secure and free from corrosion.

Quality Replacement Parts

When making repairs, always use high-quality replacement parts. Poor quality parts can fail prematurely and may not provide the correct readings to the ECU, leading to further issues down the line.


In conclusion, the P0119 error code is a significant issue that requires immediate attention to prevent potential engine damage. With a good understanding of the problem, along with the right tools and approach, you can diagnose and fix this issue effectively. Regular maintenance and quality parts can also prevent such issues from occurring in the first place.


1. Can I drive my car with a P0119 error code?

While your car might still run with a P0119 error code, it’s not recommended. The incorrect temperature reading can lead to suboptimal performance and potential engine damage.

2. How much does it cost to fix a P0119 error code?

The cost can vary depending on the cause. A new ECT sensor might cost between $50 and $150, excluding labor costs. However, if the ECM needs replacing, the cost can rise significantly.

3. How can I prevent a P0119 error code?

Regular maintenance and using quality parts during repairs can help prevent a P0119 error code. Regularly inspect the ECT sensor and its connections, and replace the sensor if necessary.

4. Can a faulty thermostat cause a P0119 error code?

While a faulty thermostat can cause temperature-related issues, it won’t typically cause a P0119 error code. This code specifically relates to issues within the ECT sensor circuit.

5. Is a P0119 error code serious?

Yes, a P0119 error code is serious. If left unchecked, it can lead to poor engine performance and potentially severe engine damage due to overheating.