P0300 on Peugeot: How to Diagnose & Fix
Random/Multiple Cylinder Misfire Detected
2 Peugeot models · 3 documented issues · $80-$900 repair
P0300 on Peugeot by model: symptoms, diagnosis and fix
The wasted-spark coil pack on the 206's small petrol engines (1.1 KFV, 1.4 KFW and related TU units) is a frequent failure item: one of the two internal coils breaks down, dropping spark on a paired set of cylinders (1/4 or 2/3). Owners report intermittent misfire, rough running, the engine cutting out and refusing to restart until it cools, and the management light flickering. Forum consensus also warns that cheap aftermarket replacement packs often fail repeatedly or seat poorly, causing the fault to return.
Common Symptoms
- Misfire on two cylinders, rough idle
- Intermittent stalling or cutting out, restarts after cooling
- Engine management light flickering or on
- Hesitation and loss of power under acceleration
- Hard or failed starting in damp weather
How to Fix
Replace the coil pack — OEM-quality (Sagem/Valeo/Bosch) units are strongly recommended over cheap aftermarket packs — along with spark plugs if worn. The job is a straightforward DIY or sub-one-hour shop task on these engines.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Valeo 245097 ignition-coil rail, OE 5970A8
Peugeot 206 TU1/TU3 8-valve KFV/KFW/KFX family where the existing OE is 5970A8/597078/597079. Four-pin rail; not NFU TU5JP4.
- Valeo 245095 ignition-coil rail, OE 597080
Confirm VIN, OE number and connector before purchase.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (4)
- Repeated Coil Pack Failures (2000 206 1.4i petrol, three coil packs failed incl. aftermarket) — Peugeot Forumsforum
- Peugeot 206 1.4 05 petrol misfiring, dealership cannot find what's wrong — Peugeot Forumsforum
- Peugeot 206 2003 Coil Pack Failure — dealer-acknowledged known problem (Sagem vs Bougicord packs) — Honest John Back Roomforum
- How to diagnose a misfiring Peugeot 206 (1.4 KFW wasted-spark DIS case study) — Professional Motor Mechanicarticle
A very common 206 complaint on multiplexed cars is the 'Anti-pollution fault' message on the multifunction display, often accompanied by the engine management light, misfire, lost power or limp mode. It is a generic emissions-system alert triggered by a range of root causes documented across owner forums: failing ignition coils, lambda (oxygen) sensor faults, sticking EGR valves, sticky hydraulic tappets and, on neglected cars, catalytic converters damaged by sustained misfiring. Because the message is generic, owners frequently replace the wrong parts before reading the stored fault codes.
Common Symptoms
- 'Anti-pollution fault' message on the multifunction display
- Engine management light on
- Misfire or juddering, especially under load
- Loss of power or limp mode
- Engine cutting out shortly after the warning appears
How to Fix
Read the stored DTCs with PSA-capable diagnostics rather than guessing; the accepted fixes are replacing the specific failed component — most commonly an ignition coil pack or lambda sensor, cleaning or replacing the EGR valve, or replacing a misfire-damaged catalytic converter in advanced cases.
Sources for this issue (3)
Because the turbocharged 1.6 THP (EP6DT/EP6CDT/EP6DTS) injects fuel directly into the cylinder, no fuel washes over the backs of the intake valves; oil vapour from the PCV system bakes onto the valves and ports as hard carbon. Deposits typically become symptomatic between 50,000 and 80,000 km, progressively restricting airflow and causing rough cold idle, cold-start misfires, poor throttle response and higher fuel consumption.
Common Symptoms
- Rough idle, especially when cold
- Random misfires on cold start
- Hesitation and poor throttle response
- Noticeable loss of power
- Increased fuel consumption
How to Fix
Walnut-shell blasting of the intake ports and valves is the accepted fix (roughly $350-900 at independent specialists; dealer quotes can be far higher) and is worth repeating preventively every 50,000-60,000 km. Quality fuel and regular oil changes slow, but do not prevent, re-accumulation.
Sources for this issue (3)
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 Peugeot?
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 Peugeot it is documented across 2 models: 206, 308.
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 Peugeot?
Published repair estimates on Peugeot range from $80 to $900 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 P0300 on a different make?
View P0300 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.