BMW DTC P1304 – Ignition Monitoring Cylinder 4 Spark Duration Too Short
DTC P1304 meaning on BMW
DTC P1304 on a BMW indicates that the Ignition Monitoring Cylinder 4 Spark Duration is too short. This means that the spark plug in cylinder 4 is not firing for the correct amount of time, which can lead to misfires and poor engine performance.
BMW DTC P1304 symptoms
Symptoms of DTC P1304 on a BMW may include rough idling, engine misfires, loss of power, and potentially an illuminated check engine light on the dashboard.
BMW DTC P1304 causes
The most common causes of DTC P1304 on a BMW include a faulty spark plug in cylinder 4, a malfunctioning ignition coil, wiring issues, or a problem with the engine control module (ECM).
BMW DTC P1304 seriousness
Ignoring DTC P1304 on a BMW can lead to further engine damage, reduced fuel efficiency, and potential drivability issues. It is important to address this issue promptly to prevent more severe problems.
How to diagnose DTC P1304 on BMW
To diagnose DTC P1304 on a BMW, a mechanic would typically start by inspecting the spark plug in cylinder 4, checking the ignition coil, and examining the wiring for any damage or loose connections. Using a diagnostic scanner to read live data and perform a cylinder balance test can also help pinpoint the issue.
How to fix DTC P1304 on BMW
Fixing DTC P1304 on a BMW may involve replacing the spark plug in cylinder 4, replacing the ignition coil if faulty, repairing any damaged wiring, or reprogramming the engine control module (ECM) if necessary. It is recommended to follow the manufacturer’s repair procedures for a proper fix.
How to erase DTC P1304 on BMW
Once the underlying issue causing DTC P1304 on a BMW has been resolved, the diagnostic trouble code 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 faults.
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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