A misfire was detected during the first 1000 engine revolutions after start — often cold-start related. Common on Ford and other brands with coil or injector issues that improve when warm.
Common symptoms
- Rough cold start that smooths out when warm
- Check engine light
- May accompany P0301–P0308
Typical causes
- Weak coil or plug more noticeable when cold
- Low fuel pressure on startup
- Vacuum leak
- Low compression on one cylinder
What scanner do you need?
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)
Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.
Diagnostic tips
- Record freeze frame data when the code first sets
- Clear the code only after fixing the root cause
- Check for related pending codes that point to a common issue
- Verify battery voltage is above 12.4V before chasing sensor codes