P0303: Cylinder 3 Misfire Detected
Combustion misfire isolated to Cylinder 3.
| Trouble Code (DTC) | P0303 |
|---|---|
| Official SAE Definition | Cylinder 3 Misfire Detected |
| Vehicle Subsystem | powertrain |
| Driving Severity | HIGH |
Observable Symptoms
- Rough idle
- Hesitation under load
- MIL illuminated
Most Probable Root Causes
- Faulty Cylinder 3 coil pack or spark plug
- Injector wiring or spray pattern fault
- Mechanical compression loss
Step-by-Step Diagnostic Procedure
- Swap coil pack with another cylinder
- Inspect spark plug and high-tension boot
- Test injector pulse and cylinder compression