P0300 on Citroen: How to Diagnose & Fix
Random/Multiple Cylinder Misfire Detected
1 Citroen model · 1 documented issue · $60-$200 repair
P0300 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. Before replacing coils, swap the suspect coil to another cylinder to confirm the misfire follows it, because misfires on the 1KR-FE are also commonly caused by oil-carbon-fouled spark plugs. 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 (2)
P0300 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 P0300 mean on a Citroen?
P0300 stands for "Random/Multiple Cylinder Misfire Detected." P0300 means the engine computer detected misfires occurring randomly or across multiple cylinders rather than in one specific cylinder. A misfire is when a cylinder fails to ignite its fuel-air mixture properly, which the computer senses through small fluctuations in crankshaft speed. Because it's not isolated to one cylinder, the cause is usually something that affects the whole engine — like fuel, air, or ignition system problems — rather than a single coil or plug. Persistent or heavy misfiring wastes fuel, runs rough, and can damage the catalytic converter, which is why a flashing check engine light should be taken seriously. On Citroen it is documented across 1 model: C1.
What are the most common causes of P0300?
The most common causes of P0300 are: Worn or fouled spark plugs (across cylinders), Vacuum or intake air leak, Weak fuel pump, clogged fuel filter, or low fuel pressure, Failing ignition coils or worn spark plug wires, Dirty or faulty mass airflow (MAF) sensor, Clogged or dirty fuel injectors, Faulty crankshaft/camshaft position sensor, Low compression or EGR/PCV system faults. The specific cause varies by vehicle.
How much does it cost to fix P0300 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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.