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Engine-Codes – BMW – P1385 BMW

P1385 BMW Code - Knock Sensor 4 Circuit

Quick Answer

The P1385 BMW code refers to an issue with the Knock Sensor 4 Circuit. Common causes include Faulty knock sensor, Wiring issues or corrosion, ECM malfunction. 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
P1385 BMW indicates Knock Sensor 4 Circuit.
Common causes
Common causes include Faulty knock sensor, Wiring issues or corrosion, ECM malfunction.
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 07, 2024
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Code P1385 BMW Description

The P1385 BMW code refers to an issue with the Knock Sensor 4 Circuit. In modern vehicles, knock sensors are crucial components that monitor the engine's combustion process and detect any abnormal knocking or pinging noises. When the knock sensor detects these noises, it sends a signal to the engine control module (ECM) to adjust the ignition timing and prevent engine damage.

OBDII Code P1385 BMW - Knock Sensor 4 Circuit
P1385 BMW Code - Knock Sensor 4 Circuit

Common Causes of P1385 BMW

  1. Faulty knock sensor
  2. Wiring issues or corrosion
  3. ECM malfunction
  4. Poor quality fuel
  5. Engine overheating

Symptoms of P1385 BMW

  1. Engine knocking or pinging noises
  2. Reduced engine power
  3. Poor fuel efficiency
  4. Check Engine Light illuminated on the dashboard
  5. Engine misfires

How to Fix P1385 BMW

  1. Diagnose the issue using a scan tool to read the fault codes and test the knock sensor.
  2. Inspect the wiring harness for any signs of damage or corrosion, and repair or replace as needed.
  3. Test the knock sensor's resistance to ensure it is within the manufacturer's specifications.
  4. If the knock sensor is faulty, replace it with a new one and clear the fault codes from the ECM.
  5. Test drive the vehicle to ensure the issue has been resolved and the Check Engine Light does not reappear.

Cost to Fix P1385 BMW

The cost of repairing a P1385 BMW code can vary depending on the specific cause of the issue and the labor rates in your area. Typically, replacing a knock sensor can cost between $150 and $300, while wiring repairs or ECM replacement may increase the cost. In total, you can expect to pay anywhere from $200 to $500 for this repair, including parts and labor. It's recommended to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on your vehicle's make and model.

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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 P1385 BMW Code

1. What does the OBDII code P1385 mean on a BMW?

P1385 indicates a malfunction in the Knock Sensor 4 Circuit, which monitors engine vibrations to detect pre-ignition or engine knocking.

2. What are the common symptoms of the P1385 code on a BMW?

Symptoms may include poor engine performance, reduced fuel efficiency, engine knocking, illuminated check engine light, and potential hesitation during acceleration.

3. What causes the P1385 code to appear on a BMW?

Common causes include a faulty knock sensor, damaged wiring or connectors in the knock sensor circuit, an ECU issue, or excessive engine vibrations.

4. Can I drive my BMW with the P1385 code active?

Driving with this code is possible but not recommended, as engine knocking can cause long-term damage if not addressed promptly.

5. How do I diagnose the P1385 code on my BMW?

Diagnosis involves checking the knock sensor and its wiring for damage, testing the sensor with a multimeter, and inspecting the ECU for faults.

6. How do I fix the P1385 code on a BMW?

Repairs may include replacing the knock sensor, repairing damaged wiring or connectors, or reprogramming/repairing the ECU if necessary.

7. Where is Knock Sensor 4 located on a BMW?

Knock Sensor 4 is typically located on the engine block, near the cylinders it monitors, but the exact location depends on the BMW model.

8. How much does it cost to repair the P1385 code on a BMW?

Repair costs vary, but replacing a knock sensor typically ranges from $150 to $400, including parts and labor.

9. Can a faulty knock sensor cause engine damage?

Yes, a faulty knock sensor can fail to detect knocking, potentially leading to engine damage from uncontrolled combustion.

10. Will clearing the P1385 code fix the problem?

Clearing the code may turn off the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.

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