P0308 meaning: Cylinder 8 Misfire Explained
Learn what P0308 means, common causes, DIY checks, and when to consult a specialist. Clear, factual guidance for car owners.
At a glance
| Severity | Can you keep driving? | DIY difficulty | Typical fix path |
|---|---|---|---|
| moderate — fix soon | short trips only | varies | scan, inspect, repair |
What does P0308 mean?
P0308 means a misfire was detected in cylinder 8 of the engine.
Common causes of P0308
The most frequent reasons include:
- Faulty spark plug or ignition coil for cylinder 8
- Clogged or leaking fuel injector
- Low compression due to worn piston rings or valve issues
- Vacuum leak near cylinder 8
- Engine mechanical problems like a burnt valve
What shows on a live scan?
During a live scan, you may see misfire counts for cylinder 8 increase during acceleration. Other related PIDs might include short-term and long-term fuel trim values that shift abnormally. The exact numbers vary by vehicle, so confirm with a specialist.
DIY-safe check for P0308
Inspect the spark plug and ignition coil for cylinder 8. Look for carbon buildup, cracks, or excessive wear. Replace the spark plug if it appears damaged or worn. This is a simple step that can sometimes resolve the issue.
When to consult a specialist
If the misfire persists after checking the spark plug and coil, or if compression tests reveal low pressure, it is time to consult a specialist. Also seek professional help if multiple codes appear alongside P0308, as this may indicate a deeper engine issue.
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FAQ
What does P0308 mean?
P0308 indicates a misfire in cylinder 8 of the engine, meaning the fuel in that cylinder is not igniting properly.
Can I keep driving with P0308?
Driving with P0308 is not recommended for extended periods, as it can cause engine damage or reduced performance. Limit driving to short trips and address the issue promptly.
How much does it cost to fix P0308?
The repair cost varies depending on the cause, but typically ranges from moderate to higher if major components like injectors or internal engine parts need replacement.
Can I fix P0308 myself?
Basic checks like inspecting the spark plug or coil can be done at home, but diagnosing deeper issues like compression problems requires professional tools and expertise.
Talk to a specialist
If you're unsure about the next steps, talk to a specialist to get an accurate diagnosis and repair plan.