P0301 on Citroen
Cylinder 1 Misfire Detected
P0301 on Citroen vehicles indicates cylinder 1 misfire detected. Au7o has documented this code across 1 Citroen model — most commonly on C1. 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. Typical repair costs on Citroen range from $60 to $200, depending on the specific model and root cause.
Common Causes of P0301
- •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
P0301 on Citroen by Model
Citroen C1(1 issue)
- Ignition Coil Failure2005-2022
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.
Looking for P0301 on a different make?
View P0301 across all makes →Frequently Asked Questions
What does P0301 mean on 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 specifically, this code is documented across 1 model.
What causes P0301 on Citroen vehicles?▼
Common causes on Citroen: 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). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0301 on a Citroen?▼
Repair costs on Citroen range from $60 to $200, depending on the specific model and root cause.
Which Citroen models have P0301 documented?▼
Au7o has documented P0301 on 1 Citroen model: C1.