Is it safe to drive with Misfires only on cylinder 4 — P0304 specific diagnosis?

Generally safe to drive for short distances, but the fault should be diagnosed and repaired promptly.

🟢 Misfires only on cylinder 4 — P0304 specific diagnosis

On This Page: 🔍 Symptoms ⚙️ Causes 🔧 All Repairs ⚠️ Avoid These 🧾 Driver Reports 📖 Repair Guides

⚡ Quick Summary

Severity Level

High

Safe to Drive?

⚠️ Drive with Caution

Safety Impact

Can become a safety issue if left unresolved

Urgency Level

🟠 Fix Soon

P0304 cylinder 4 misfire. Rough idle. Check engine light flashing on acceleration. This fault code is stored when the engine control unit detects a specific fault condition. Common causes include sensor failures, wiring faults, and component wear. Always read additional fault codes before replacing parts — multiple codes together provide a clearer diagnosis. Clear the code after repair and test drive to confirm the fault does not return.

🔍 Symptoms

📍 Multiple ⚠️ P0304 fault code

⚙️ Possible Causes

Fault code P0304 detected Multiple Possible: Cylinder-specific misfire (P0304 = cyl 4): Swap test method — move coil from cylinder 4 to cylinder 2. If code changes to P0302, the coil is bad. If P0304 stays on cylinder 4, try swapping spark plug. If still P0304 after coil and plug swapped, suspect in

Repair / Solution

Based on 54 driver confirmations

0 worked · 0 did not · ⚪ Unverified

⚠️ Wrong Diagnosis?

No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.

🧾 Driver Reports

✅ Fixed Cylinder-specific misfire (P0304 = cyl 4): Swap test method — move coil from cylinder 4 to cylinder 2. If code changes to P0302, the coil is bad. If P0304 stays on cylinder 4, try swapping spark plug. If still P0304 after coil and plug swapped, suspect in

Cylinder-specific misfire (P0304 = cyl 4): Swap test method — move coil from cylinder 4 to cylinder 2. If code changes to P0302, the coil is bad. If P0304 stays on cylinder 4, try swapping spark plug. If still P0304 after coil and plug swapped, suspect injector or compression issue. Compression test: below 120 PSI or more than 10% difference between cylinders = mechanical issue. Coil replacements: $30-60 each, replace just the bad one (not all 4 unless very high mileage).

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