P0301 on Renault: How to Diagnose & Fix
Cylinder 1 Misfire Detected
1 Renault model · 1 documented issue · $80-$250 repair
P0301 on Renault by model: symptoms, diagnosis and fix
The Clio II and III petrol engines suffer from premature ignition coil pack failure, causing misfires and rough running. The coil packs crack from heat cycling and moisture ingress, particularly on the 1.2 and 1.4 engines.
Common Symptoms
- Engine misfire
- Rough idle
- Hesitation under acceleration
- Check engine light flashing
How to Fix
Replace the faulty coil pack. It is recommended to replace all coil packs simultaneously and use OEM Sagem units. Inspect and replace spark plugs at the same time.
Sources for this issue (1)
P0301 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0301 mean on a Renault?
P0301 stands for "Cylinder 1 Misfire Detected." P0301 means the engine computer detected a misfire specifically in cylinder 1 — the spark didn't ignite the fuel properly, or the fuel/air mix didn't burn as it should. The computer detects this by sensing tiny variations in crankshaft speed each time a cylinder fires. A misfire wastes fuel, raises emissions, and can damage the catalytic converter if it's severe or persistent (a flashing check engine light usually warns of active, converter-damaging misfires). Because the code points to one specific cylinder, the cause is usually an ignition, fuel, or compression problem isolated to that cylinder. On Renault it is documented across 1 model: Clio.
What are the most common causes of P0301?
The most common causes of P0301 are: Worn or fouled spark plug in cylinder 1, Failed ignition coil or coil pack for cylinder 1, Faulty or clogged fuel injector for cylinder 1, Vacuum or intake air leak affecting that cylinder, Bad spark plug wire (on applicable engines), Low compression (worn rings, leaking or burnt valve, head gasket), Carbon buildup on intake valves, Wiring or connector fault to the coil or injector. The specific cause varies by vehicle.
How much does it cost to fix P0301 on a Renault?
Published repair estimates on Renault range from $80 to $250 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0301 on a different make?
View P0301 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.