BMW DTC P1385 – Knock Sensor 4 Circuit
DTC P1385 meaning on BMW
The DTC P1385 code on a BMW indicates a problem with Knock Sensor 4 Circuit. The knock sensor is responsible for detecting abnormal vibrations in the engine caused by pre-ignition or detonation. When the knock sensor detects these vibrations, it sends a signal to the engine control module (ECM) to adjust the ignition timing to prevent engine damage.
BMW DTC P1385 symptoms
Some common symptoms of a DTC P1385 code on a BMW may include engine knocking or pinging noises, reduced engine performance, decreased fuel efficiency, and in some cases, the Check Engine Light may illuminate on the dashboard.
BMW DTC P1385 causes
The DTC P1385 code on a BMW can be triggered by various factors, including a faulty knock sensor, wiring issues in the knock sensor circuit, poor electrical connections, or a problem with the ECM.
BMW DTC P1385 seriousness
Ignoring a DTC P1385 code on a BMW can lead to potential engine damage due to incorrect ignition timing. It is important to address this issue promptly to prevent further complications.
How to diagnose DTC P1385 on BMW
Diagnosing a DTC P1385 code on a BMW involves using a diagnostic scanner to retrieve the fault codes stored in the ECM. A visual inspection of the knock sensor and its wiring for any visible damage should be conducted. Additionally, testing the knock sensor’s resistance and checking the wiring continuity can help pinpoint the issue.
How to fix DTC P1385 on BMW
To fix a DTC P1385 code on a BMW, the faulty knock sensor or damaged wiring should be replaced. Ensure all electrical connections are secure and free of corrosion. After replacing the knock sensor, clear the fault codes from the ECM and test drive the vehicle to verify that the issue has been resolved.
How to erase DTC P1385 on BMW
To erase a DTC P1385 code on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECM. Once the codes are cleared, the Check Engine Light should turn off. It is important to ensure that the underlying issue causing the fault code has been addressed before clearing the codes.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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