P0308 – BMW DTC

BMW DTC P0308 – Cylinder 8 Misfire Detected

DTC P0308 meaning on BMW

The Diagnostic Trouble Code (DTC) P0308 for BMW indicates that a misfire has been detected in cylinder 8 of the engine. This means that the engine control module (ECM) has detected a lack of combustion or incomplete combustion in the specific cylinder during the engine’s operation.

BMW DTC P0308 symptoms

Symptoms of a DTC P0308 on a BMW may include:

• Check Engine Light (CEL) illuminated
• Engine running rough or vibrating
• Loss of power or acceleration
• Increased fuel consumption
• Engine may emit unusual noises

BMW DTC P0308 causes

Common causes of a DTC P0308 on a BMW include:

• Ignition system issues such as faulty spark plugs or ignition coils
• Fuel system problems like clogged fuel injectors or low fuel pressure
• Vacuum leaks in the intake system
• Compression issues in the cylinder
• Engine timing problems

BMW DTC P0308 seriousness

Ignoring a DTC P0308 on a BMW can lead to more severe engine damage over time. A misfiring cylinder can cause increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter. It is important to address this issue promptly to prevent further complications.

How to diagnose DTC P0308 on BMW

To diagnose a DTC P0308 on a BMW, you can perform the following steps:

1. Use a diagnostic scanner to retrieve the specific fault code
2. Inspect the ignition system components such as spark plugs and ignition coils
3. Check the fuel system for any issues like clogged injectors or low pressure
4. Inspect the intake system for vacuum leaks
5. Perform a compression test on cylinder 8
6. Check the engine timing

How to fix DTC P0308 on BMW

To fix a DTC P0308 on a BMW, you can take the following actions:

1. Replace faulty spark plugs or ignition coils
2. Clean or replace clogged fuel injectors
3. Repair any vacuum leaks in the intake system
4. Address any compression issues in cylinder 8
5. Adjust engine timing if necessary

How to erase DTC P0308 on BMW

After fixing the underlying issue causing the DTC P0308 on a BMW, you can erase the fault code using a diagnostic scanner. Clearing the code will reset the Check Engine Light and allow you to monitor the system for any recurring issues. Make sure the repair has been successful before clearing the code.

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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