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Engine-Codes – BMW – P1585 BMW

P1585 BMW Code - Random Multiple Cylinder Misfire Detected

Quick Answer

The P1585 BMW code indicates that a random multiple cylinder misfire has been detected in the vehicle's engine. Common causes include Faulty spark plugs, Bad ignition coils, Clogged fuel injectors. 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
P1585 BMW indicates Random Multiple Cylinder Misfire Detected.
Common causes
Common causes include Faulty spark plugs, Bad ignition coils, Clogged fuel injectors.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1585 BMW Description

The P1585 BMW code indicates that a random multiple cylinder misfire has been detected in the vehicle's engine. This means that the engine is not running smoothly and is not firing on all cylinders as it should. A misfire occurs when the air-fuel mixture in a cylinder fails to ignite at the proper time, causing a disruption in the combustion process. This can lead to a loss of power, rough idling, hesitation, and poor fuel efficiency.

OBDII Code P1585 BMW - Random Multiple Cylinder Misfire Detected
P1585 BMW Code - Random Multiple Cylinder Misfire Detected

Common Causes of P1585 BMW

  1. Faulty spark plugs
  2. Bad ignition coils
  3. Clogged fuel injectors
  4. Low fuel pressure
  5. Vacuum leaks

Symptoms of P1585 BMW

  1. Rough idling
  2. Loss of power
  3. Hesitation or stumbling during acceleration
  4. Engine vibration
  5. Poor fuel efficiency

How to Fix P1585 BMW

  1. Diagnose the specific cylinder(s) that are misfiring using a scan tool.
  2. Inspect and replace faulty spark plugs, ignition coils, or ignition wires.
  3. Clean or replace clogged fuel injectors.
  4. Check and correct any vacuum leaks.
  5. Perform a compression test to check for internal engine issues.

Cost to Fix P1585 BMW

The cost of repairing a random multiple cylinder misfire can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay anywhere from $100 to $500 for parts and labor. Keep in mind that additional diagnostic time may be needed to pinpoint the exact cause of the misfire, so it's a good idea to consult with a professional mechanic for a more accurate cost estimate.

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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 P1585 BMW Code

1. What does the OBDII code P1585 mean on a BMW?

P1585 indicates a "Random Multiple Cylinder Misfire Detected," meaning the engine's cylinders are misfiring unpredictably.

2. What are the common symptoms of the P1585 code on a BMW?

Symptoms can include rough idling, loss of power, poor fuel economy, hesitation during acceleration, and the Check Engine Light turning on.

3. What causes the P1585 code in a BMW?

Common causes include faulty spark plugs, ignition coils, vacuum leaks, fuel delivery issues, or a malfunctioning MAF (Mass Airflow) sensor.

4. Can a dirty air filter trigger the P1585 code on a BMW?

Yes, a clogged air filter can restrict airflow and contribute to misfires, potentially triggering the P1585 code.

5. How do I diagnose the P1585 code on my BMW?

Use an OBDII scanner to confirm the code, inspect ignition components, check for vacuum leaks, test fuel pressure, and examine the MAF sensor for contamination or failure.

6. Is it safe to drive my BMW with the P1585 code?

Driving with this code is not recommended, as continued misfires can cause damage to the catalytic converter or other engine components.

7. How can I fix the BMW P1585 code?

Repairs may include replacing spark plugs or ignition coils, cleaning or replacing the MAF sensor, fixing vacuum leaks, or addressing fuel system issues.

8. Can low-quality fuel cause the P1585 code on a BMW?

Yes, poor-quality fuel or contaminated fuel can lead to misfires and trigger the P1585 code.

9. How much does it cost to repair the P1585 code on a BMW?

Costs vary depending on the root cause; replacing spark plugs might cost $100-$200, while more extensive repairs like fuel pump replacement can exceed $500.

10. Can a failing oxygen sensor be related to the P1585 code?

While not a primary cause, a faulty oxygen sensor can contribute to air-fuel mixture issues that may increase the likelihood of misfires.

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