BMW DTC P301D – Injector 4 Stuck Open
DTC P301D meaning on BMW
The Diagnostic Trouble Code (DTC) P301D for BMW indicates that Injector 4 is stuck open. This means that the fuel injector for cylinder 4 is not closing properly, causing an excessive amount of fuel to be delivered to that cylinder.
BMW DTC P301D symptoms
Symptoms of DTC P301D on a BMW may include rough idling, misfires, decreased fuel efficiency, loss of power, and potentially black smoke coming from the exhaust due to the rich fuel mixture.
BMW DTC P301D causes
The causes of DTC P301D on a BMW can vary, but common reasons include a faulty fuel injector, wiring issues, or a problem with the Engine Control Module (ECM) that controls the injector operation.
BMW DTC P301D seriousness
Ignoring DTC P301D on a BMW can lead to engine damage, decreased performance, and increased fuel consumption. It is important to address this issue promptly to prevent further complications.
How to diagnose DTC P301D on BMW
To diagnose DTC P301D on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes and then perform a visual inspection of the fuel injector and its wiring. They may also conduct tests to check the injector’s resistance and functionality.
How to fix DTC P301D on BMW
Fixing DTC P301D on a BMW usually involves replacing the faulty fuel injector for cylinder 4. The wiring and connections should also be inspected and repaired if necessary. After the repair, the system should be tested to ensure proper operation.
How to erase DTC P301D on BMW
Once the issue causing DTC P301D on a BMW has been fixed, the fault codes can be cleared using a diagnostic scanner. This will reset the Check Engine Light and allow the vehicle’s ECM to monitor the system for any new issues.
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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