BMW DTC P139A – Camshaft Position Sensor ‘A’ Segment Timing Error (Bank 2)
DTC P139A meaning on BMW
The DTC P139A error code on BMW vehicles indicates a Camshaft Position Sensor ‘A’ Segment Timing Error in Bank 2. This means that there is an issue with the synchronization between the camshaft position sensor and the segment timing in the second bank of the engine.
BMW DTC P139A symptoms
Symptoms of the DTC P139A error code on a BMW may include rough idling, engine misfires, reduced engine performance, and in some cases, the Check Engine Light may illuminate on the dashboard.
BMW DTC P139A causes
The common causes of the DTC P139A error code on BMW vehicles include a faulty camshaft position sensor, incorrect camshaft timing, wiring issues, or problems with the engine control module (ECM).
BMW DTC P139A seriousness
While the DTC P139A error code may not always result in immediate engine failure, it is important to address this issue promptly to prevent potential damage to the engine components and ensure optimal performance of the vehicle.
How to diagnose DTC P139A on BMW
To diagnose the DTC P139A error code on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes stored in the ECM. They would then perform a visual inspection of the camshaft position sensor and related wiring to check for any visible damage or loose connections. Additionally, a thorough inspection of the camshaft timing and ECM may be necessary to pinpoint the exact cause of the issue.
How to fix DTC P139A on BMW
Fixing the DTC P139A error code on a BMW usually involves replacing the faulty camshaft position sensor, correcting the camshaft timing if necessary, repairing any damaged wiring, and resetting the ECM. It is recommended to follow the manufacturer’s repair procedures and use genuine OEM parts to ensure a proper fix.
How to erase DTC P139A on BMW
Once the underlying issue causing the DTC P139A error code has been resolved, the code can be erased using a diagnostic scanner. By clearing the fault codes from the ECM, the Check Engine Light should turn off, indicating that the issue has been successfully addressed.
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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