OBD2 Code P0302: Cylinder 2 Misfire Detected
The P0302 code means Cylinder 2 Misfire Detected. Estimated repair cost: $80 – $1000.
✅ OK TO DRIVE (short term). Have it diagnosed at your next convenience. Monitor for new symptoms.
📋 Diagnostic Reference
| OBD2 Code | P0302 |
| Category | Powertrain |
| Severity | Check Soon |
| Repair Cost | $80 – $1000 |
| Can You Drive? | ⚠️ Yes but drive directly to a shop — limit distance |
🔍 Symptoms
- Engine vibration
- power loss
- rough idle
- fuel smell
⚠️ Most Likely Causes (in order of probability)
- Faulty spark plug cylinder 2
- failed ignition coil
- fuel injector issue
- compression loss
🛠️ Diagnostic Procedure
Step 1: Remove spark plug from cylinder 2 and inspect
Remove spark plug from cylinder 2 and inspect
Step 2: Swap coil with another cylinder to isolate
Swap coil with another cylinder to isolate
Step 3: Check fuel injector with noid light
Check fuel injector with noid light
Step 4: Perform compression test.
Perform compression test.
ASE Certified Review: This diagnostic guide has been reviewed by an ASE-certified master technician. Diagnostic steps follow industry best practices per SAE J1979 and OEM service procedures. Always verify with a qualified mechanic before performing repairs.
Technician's Notes: Cylinder-specific misfire — swap components between cylinders to diagnose without buying parts.
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Dealerships charge $100-$200 just to scan your car and read the code. A $20 Bluetooth OBD2 scanner gives you the same information in 30 seconds — and it works with free apps on your phone. Read and clear codes yourself before deciding if you need a mechanic.
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Data Sources: Diagnostic information compiled from SAE J1979 OBD2 standards, OEM service manuals, and ASE master technician field experience. Reviewed for technical accuracy. Repair cost ranges are national estimates and vary by location. Always verify with a qualified mechanic.