P0301 on Citroen: How to Diagnose & Fix
Cylinder 1 Misfire Detected
1 Citroen model · 1 documented issue · $60-$200 repair
P0301 on Citroen by model: symptoms, diagnosis and fix
The 1.0-litre three-cylinder engine in the C1 is prone to ignition coil failure, causing misfires and rough running. The coil-on-plug design makes individual cylinder misfires easy to diagnose but the coils fail frequently.
Common Symptoms
- Engine misfire
- Rough idle
- Loss of power
- Check engine light
How to Fix
Replace the faulty ignition coil. Consider replacing all three coils simultaneously as they tend to fail in sequence. Replace spark plugs at the same time.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Denso DIC-0100 ignition coil
replace the cylinder-specific coil proven faulty by scan/swap/scope diagnosis Fitment/availability: Citroen C1 PM/PN 1.0 998 cc CFA/CFB (1KR), 06/2005-09/2014 as explicitly listed; OE reference 90080-19015, verify VIN and connector, excl…
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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 Citroen?
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 Citroen it is documented across 1 model: C1.
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 Citroen?
Published repair estimates on Citroen range from $60 to $200 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.