AutoCodes – MINI – P0128 MINI

P0128 MINI Code - Thermostat Low Coolant Temperature

Quick Answer

Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine. Common causes include Leaking or stuck open thermostat, Low engine coolant level, Insufficient warm up time. 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: P0128 MINI indicates Thermostat Low Coolant Temperature .
Common causes: Common causes include Leaking or stuck open thermostat, Low engine coolant level, Insufficient warm up time.
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 23,979

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0128 MINI Description

Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.

OBDII Code P0128 MINI - Thermostat Low Coolant Temperature - AutoCodes.com — P0128 MINI Code - Thermostat Low Coolant Temperature

What does this mean?

What are the Possible Causes of the DTC P0128 MINI?

Leaking or stuck open thermostat
Low engine coolant level
Insufficient warm up time
Faulty engine coolant temperature sensor
Engine coolant temperature sensor harness is open or shorted
Engine coolant temperature sensor circuit poor electrical connection

How to Fix the DTC P0128 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 does this mean?

Code Tech Notes

If cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0128 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.

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Need more information on how to fix the P0128 MINI code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P0128 MINI Code

1. What are the common symptoms of OBDII code P0128 in a MINI related to the thermostat low coolant temperature?

- The common symptoms include a slow-to-warm-up engine, decreased fuel efficiency, and the Check Engine light illuminating on the dashboard.

2. What are the possible causes of the OBDII code P0128 in a MINI?

- The code is usually triggered by a malfunctioning thermostat, low coolant levels, a faulty engine coolant temperature sensor, or a problem with the cooling system.

3. How can I diagnose the issue causing the OBDII code P0128 in my MINI?

- You can start by checking the coolant level, inspecting the thermostat for proper operation, testing the engine coolant temperature sensor, and ensuring there are no leaks or blockages in the cooling system.

4. Is it safe to continue driving my MINI with the OBDII code P0128 present?

- It is not recommended to drive with the code active, as it can lead to inefficient engine performance and potential overheating issues. It's best to address the problem promptly.

5. Can I reset the OBDII code P0128 in my MINI myself?

- You can reset the code using an OBDII scanner, but it's crucial to first diagnose and fix the underlying issue causing the code to prevent it from reoccurring.

6. How much does it typically cost to repair the OBDII code P0128 related to a thermostat low coolant temperature in a MINI?

- The cost of repair can vary depending on the exact cause of the issue, but it generally ranges from $150 to $400, including parts and labor.

7. Are there any DIY tips for addressing the OBDII code P0128 in my MINI?

- While some simple tasks like checking coolant levels can be done at home, it's recommended to have a professional diagnose and repair the issue to ensure it's properly resolved.

8. Can a faulty thermostat cause the OBDII code P0128 in a MINI?

- Yes, a malfunctioning thermostat that is stuck open can lead to the engine not reaching its optimal operating temperature, triggering the OBDII code P0128.

9. Will fixing the OBDII code P0128 improve my MINI's overall performance?

- Yes, resolving the issue causing the code can help restore normal engine operation, improve fuel efficiency, and prevent potential damage from overheating.

10. How often should I check my MINI for coolant-related issues to prevent the OBDII code P0128 from appearing?

- It's recommended to check your MINI's coolant levels and overall cooling system health during routine maintenance intervals or if you notice any symptoms like slow engine warm-up.