BMW DTC P138D – Ion Ignition Coil Cylinder 9
DTC P138D meaning on BMW
The DTC P138D code on a BMW indicates an issue with the Ion Ignition Coil Cylinder 9. This means that there is a problem with the ignition coil specific to cylinder 9 in the engine.
BMW DTC P138D symptoms
Symptoms of the BMW DTC P138D code may include rough idling, misfiring, loss of power, and potentially an illuminated check engine light on the dashboard.
BMW DTC P138D causes
The most common causes of the BMW DTC P138D code include a faulty ignition coil, wiring issues, or a problem with the engine control module (ECM).
BMW DTC P138D seriousness
Ignoring the DTC P138D code on a BMW can lead to poor engine performance, reduced fuel efficiency, and potential damage to the catalytic converter over time. It is important to address this issue promptly.
How to diagnose DTC P138D on BMW
To diagnose the DTC P138D code on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s ECM. They would then inspect the ignition coil for cylinder 9, check the wiring for any damage, and perform further tests to pinpoint the exact cause of the issue.
How to fix DTC P138D on BMW
Fixing the DTC P138D code on a BMW usually involves replacing the faulty ignition coil for cylinder 9. Additionally, any damaged wiring should be repaired or replaced as needed. Once the repairs are completed, the vehicle should be tested to ensure that the issue has been resolved.
How to erase DTC P138D on BMW
After fixing the underlying issue causing the DTC P138D code on a BMW, 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 problem has been 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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