AutoCodes – MINI – P1478 MINI

P1478 MINI Code - Evaporative Emissions System Leak Detected

Quick Answer

P1478 MINI indicates Evaporative Emissions System Leak Detected. Common causes include Loose gas cap. 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: P1478 MINI indicates Evaporative Emissions System Leak Detected.
Common causes: Common causes include Loose gas cap.
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 1,598

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 24, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P1478 MINI Description

OBDII Code P1478 MINI - Evaporative Emissions System Leak Detected - AutoCodes.com — P1478 MINI Code - Evaporative Emissions System Leak Detected

What does this mean?

What are the Possible Causes of the DTC P1478 MINI?

Loose gas cap

How to Fix the DTC P1478 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

A common cause of the this code is a loose gas cap. Retight the gas cap and clear code.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1478 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.

Need more information about the P1478 MINI 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.