BMW DTC P13D4 – Knock Sensor 4 Circuit ‘A’ Low (Bank 2)
DTC P13D4 meaning on BMW
The DTC P13D4 fault code on BMW vehicles indicates an issue with Knock Sensor 4 Circuit ‘A’ on Bank 2. This code is triggered when the Engine Control Module (ECM) detects a low voltage signal from the knock sensor, which is responsible for detecting engine knocking or pinging.
BMW DTC P13D4 symptoms
Symptoms of the DTC P13D4 code on a BMW may include engine pinging or knocking noises, reduced engine performance, rough idling, and potentially an illuminated Check Engine Light on the dashboard.
BMW DTC P13D4 causes
The common causes of the DTC P13D4 fault code on BMW vehicles include a faulty knock sensor, wiring issues in the knock sensor circuit, poor electrical connections, or a malfunctioning Engine Control Module (ECM).
BMW DTC P13D4 seriousness
While the DTC P13D4 code may not cause immediate drivability issues, it is important to address it promptly to prevent potential engine damage and ensure optimal performance and fuel efficiency of the vehicle.
How to diagnose DTC P13D4 on BMW
To diagnose the DTC P13D4 code on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes stored in the ECM. They would then inspect the knock sensor and its wiring for any visible damage or corrosion. Testing the sensor’s resistance and checking the sensor’s signal with a multimeter may also be necessary.
How to fix DTC P13D4 on BMW
Fixing the DTC P13D4 fault code on a BMW usually involves replacing the faulty knock sensor, repairing any damaged wiring or connectors in the sensor circuit, and ensuring proper connections. Once the repairs are made, the fault codes can be cleared from the ECM to reset the Check Engine Light.
How to erase DTC P13D4 on BMW
To erase the DTC P13D4 fault code on a BMW, a diagnostic scanner can be used to clear the stored fault codes in the ECM. After the repairs have been completed and the issue resolved, clearing the fault codes will reset the Check Engine Light and ensure that the system is functioning properly.
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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