AutoCodes – BMW – P1340 BMW

P1340 BMW Code - Multiple Cylinder Misfire During Start

Quick Answer

P1340 BMW indicates Multiple Cylinder Misfire During Start. Common causes include Faulty Spark Plug, Faulty Ignition Coil, Intake vacuum leak. 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: P1340 BMW indicates Multiple Cylinder Misfire During Start.
Common causes: Common causes include Faulty Spark Plug, Faulty Ignition Coil, Intake vacuum leak.
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 11,729

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 10, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1340 BMW Description

OBDII Code P1340 BMW - Multiple Cylinder Misfire During Start - AutoCodes.com — P1340 BMW Code - Multiple Cylinder Misfire During Start

What does this mean?

What are the Possible Causes of the DTC P1340 BMW?

Faulty Spark Plug
Faulty Ignition Coil
Intake vacuum leak
Faulty Camshaft Position Sensor
Ignition Coil harness is open or shorted
Ignition Coil circuit poor electrical connection

How to Fix the DTC P1340 BMW?

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 P1340 BMW 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 P1340 BMW code?

Need more information on how to fix the P1340 BMW code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1340 BMW code diagnosed by a professional: Find a repair shop in your area

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 P1340 BMW Code

1. What are the common symptoms of OBDII code P1340 (BMW) - Multiple Cylinder Misfire During Start?

Symptoms may include rough idle, engine hesitation, loss of power, and potential stalling during startup.

2. What are the possible causes of code P1340 in a BMW?

Common causes may include faulty ignition coils, spark plugs, fuel injectors, vacuum leaks, or issues with the engine's air-fuel mixture.

3. How can I diagnose the source of the multiple cylinder misfire during start code P1340 in my BMW?

Diagnosing the issue may involve performing a visual inspection of ignition components, checking for vacuum leaks, and using a scan tool to analyze live data and pinpoint the misfiring cylinders.

4. Can driving with OBDII code P1340 (BMW) - Multiple Cylinder Misfire During Start damage the vehicle?

Continuing to drive with this code can potentially cause damage to the catalytic converter, oxygen sensors, and other engine components over time.

5. Is it safe to continue driving my BMW with the P1340 code until I can fix it?

It is not recommended to drive the vehicle with this code present, as it can lead to further engine damage and potential safety hazards.

6. Are there any quick repair tips to address OBDII code P1340 in a BMW?

Quick tips may include inspecting and replacing faulty spark plugs, ignition coils, or cleaning/replacing clogged fuel injectors to address the misfire issue.

7. How much does it typically cost to repair OBDII code P1340 (BMW) - Multiple Cylinder Misfire During Start?

The cost of repairs can vary depending on the specific cause of the misfire, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can a DIY enthusiast fix OBDII code P1340 in a BMW, or is it best left to professionals?

While some simple repairs like changing spark plugs can be done by DIY enthusiasts, diagnosing and fixing complex issues related to code P1340 may require professional expertise.

9. Will resetting the OBDII code P1340 in my BMW make the issue go away permanently?

Resetting the code without addressing the root cause of the misfire will not fix the underlying issue, and the code is likely to reappear until the problem is resolved.

10. How can regular maintenance help prevent OBDII code P1340 (BMW) - Multiple Cylinder Misfire During Start?

Regular maintenance, such as timely spark plug and ignition coil replacements, fuel system cleaning, and air filter changes, can help prevent misfires and related issues that trigger code P1340.