Practical checks and shop questions for P0300/cylinder misfire and first-start misfire; save evidence before replacing parts.
This is a non-invasive owner checklist, not an OEM repair procedure or permission to drive.
This reference supports the stated topic only. Model, model year, equipment, current rule or individual vehicle conditions may differ; check the original source before acting.
Read the Ford original: Gasoline OBD System Operation Summary MY 2024–2025 Source date: 2024-04-16; research checked: 2026-11-01.
Codes in this diagnostic topic
These codes share a system-level checklist, but their distinct numbers and meanings are shown below. A code here does not prove a particular vehicle has every listed fault. Use the exact code row and full scan.
| Code | Meaning | Vehicle scope |
|---|---|---|
| P0300 | Random or multiple-cylinder misfire | Exact vehicle scope unverified |
| P0301 | Misfire reported for cylinder 1 | Exact vehicle scope unverified |
| P0302 | Misfire reported for cylinder 2 | Exact vehicle scope unverified |
| P0303 | Misfire reported for cylinder 3 | Exact vehicle scope unverified |
| P0304 | Misfire reported for cylinder 4 | Exact vehicle scope unverified |
| P0305 | Misfire reported for cylinder 5 | Exact vehicle scope unverified |
| P0306 | Misfire reported for cylinder 6 | Exact vehicle scope unverified |
| P0307 | Misfire reported for cylinder 7 | Exact vehicle scope unverified |
| P0308 | Misfire reported for cylinder 8 | Exact vehicle scope unverified |
| P0309 | Misfire reported for cylinder 9 | Exact vehicle scope unverified |
| P0310 | Misfire reported for cylinder 10 | Exact vehicle scope unverified |
| P0313 | Misfire with low-fuel context | Exact vehicle scope unverified |
| P0316 | Misfire during first 1,000 revolutions | Exact vehicle scope unverified |
| P0351 | Ignition-coil A circuit fault | Exact vehicle scope unverified |
| P0352 | Ignition-coil B circuit fault | Exact vehicle scope unverified |
| P0353 | Ignition-coil C circuit fault | Exact vehicle scope unverified |
| P0354 | Ignition-coil D circuit fault | Exact vehicle scope unverified |
Save the evidence first
- Full codes with status and suffix
- RPM/load/coolant temperature and startup timing
- Flashing versus steady MIL; vibration and power loss
- Recent plug, fuel or engine work
Safe owner checks
- Park safely before using the scanner. Save the scan and freeze frame.
- When fully stopped and safe, note any obvious loose intake connection without touching moving/hot parts.
- Check whether a narrowly matching software bulletin exists.
Questions for a qualified technician
- 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?
- For Ford 25-2293, does recorded ECT meet the documented temperature branch?
Common wrong turns
- A cylinder code identifies a reported cylinder, not a proven bad coil.
- Do not swap coils using a generic cylinder-location diagram.
- Do not reproduce a severe misfire on a test drive.
Confirm the repair
- Have the shop verify the original operating condition and related codes.
- A cleared lamp alone is not proof that the cause is repaired.
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
- Ford — 1999 Powertrain Control/Emissions Diagnosis DTC descriptions Document: date not recorded · 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.