AutoCodes – MINI – P1304 MINI

P1304 MINI Code - Misfiring Cylinder 4

Quick Answer

P1304 MINI indicates Misfiring Cylinder 4. Common causes include Faulty Spark Plug #4, Faulty Ignition Coil 4, Ignition Coil 4 harness is open or shorted. 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: P1304 MINI indicates Misfiring Cylinder 4.
Common causes: Common causes include Faulty Spark Plug #4, Faulty Ignition Coil 4, Ignition Coil 4 harness is open or shorted.
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 1,609

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 May 20, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P1304 MINI Description

OBDII Code P1304 MINI - Misfiring Cylinder 4 - AutoCodes.com — P1304 MINI Code - Misfiring Cylinder 4

What does this mean?

What are the Possible Causes of the DTC P1304 MINI?

Faulty Spark Plug #4
Faulty Ignition Coil 4
Ignition Coil 4 harness is open or shorted
Ignition Coil 4 circuit poor electrical connection

How to Fix the DTC P1304 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

Ignition monitoring cylinder spark duration too short

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1304 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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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.