P0308 is reported as misfire reported for cylinder 8. The next step depends on the full scan and the exact vehicle, not the code alone.
If the check-engine light is flashing, the engine runs roughly, or the vehicle is losing power, pull over safely and arrange help. Otherwise save the scan and arrange diagnosis.
This Ford document supports only its stated code and vehicle context. The code alone cannot identify a failed part, prove that another make uses the same definition, or clear a car for driving. Compare your full scan with the current exact-vehicle service information.
Read the Ford original: Gasoline OBD System Operation Summary MY 2024–2025 Source date: 2024-04-16; research checked: 2026-11-01.
What this code means
P0308: Misfire reported for cylinder 8. This is a source-scoped technical description. It does not prove that any named component has failed.
Namespace obd_reference
Make scope No exact vehicle application established
Definition status source supported definition vehicle applicability unverified
Why this exact cylinder code matters
P0308 identifies a misfire reported for cylinder 8 in the cited OBD monitor. It does not locate a coil, prove that cylinder 8 has a bad plug or establish why the misfire occurred. A code naming cylinder 8 is not a fit for a verified engine with fewer than 8 cylinders; recheck the raw scan and engine identification. Check whether P0300 or another cylinder code appeared under the same operating condition, then ask which measured test isolates ignition, fuel, air or compression on this engine.
Evidence to save for this code
- Full codes with status and suffix
- RPM/load/coolant temperature and startup timing
Keep the complete module scan and any accompanying warning; a single emissions code cannot show every relevant fault.
Ask for a measured diagnosis
- Do ignition, fuel delivery, air leaks or mechanical compression explain the affected cylinders?
- Does an exact-engine compression/leak-down or ignition waveform test distinguish the cause?
The Misfire: preserve evidence before buying ignition parts guide has the shared system checks and after-repair questions. Those broad checks apply to a system, while the meaning above is specific to P0308.
Vehicle and scanner limits
We have not verified this code for every make, model, year or engine. A generic emissions scanner may not read the body, chassis, transmission or EV module that holds related faults. Compare the full scan with the owner manual and manufacturer service information.
Sources and scope
- Ford — Gasoline OBD System Operation Summary MY 2024–2025 Document: 2024-04-16 · Research checked: 2026-11-01
- Ford — OBD System Operation Summary, gasoline 2020–2023 update Document: 2023-10-23 · Research checked: 2026-11-01
- Ford — 25-2293 Document: 2025-07-03 · Research checked: 2026-11-01
Research snapshot: 2026-11-01. Source documents may have newer revisions. Verify current instructions and VIN eligibility with the manufacturer.