P0303 on Skoda: How to Diagnose & Fix
Cylinder 3 Misfire Detected
2 Skoda models · 3 documented issues · 2 critical · $60-$3,500 repair
P0303 on Skoda by model: symptoms, diagnosis and fix
The Fabia Mk1's combined ignition coil pack (1.4 16v MPI and related petrol engines) is a frequent failure point. When it fails the car misfires, idles roughly, loses power and may stall, with the engine management light on. Briskoda threads include owners who needed multiple coil packs (some replaced under Skoda goodwill). It is a cheap, well-known DIY fix once diagnosed.
Common Symptoms
- Engine misfire
- Rough idle
- Loss of power
- Stalling
- Engine management light (EML)
How to Fix
Read for cylinder misfire codes (P0300-P0304). Replace the coil pack (and spark plugs/HT leads if applicable) with a genuine or quality OE-equivalent unit; this usually clears the misfire and warning light.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- OE-producer 032905106F ignition module
replace a tested failed shared ignition module on the early AUA/AUB branch Fitment/availability: Skoda Fabia Mk1 1.4 16V AUA or AUB branch using the shared ignition module and high-tension leads; also listed for other engines, but this c…
- OE-producer 036905715H direct ignition coil
replace the single direct coil proven faulty by swap or waveform testing Fitment/availability: Skoda Fabia Mk1 1.4 16V BBY/BKY/BBZ or 1.2 HTP AZQ/BME as explicitly listed; confirm engine code and installed coil number, excludes AUA/AUB s…
- Genuine Skoda 03D905715A ignition coil
replace a tested failed direct coil on the AWY/BMD engine branch Fitment/availability: Skoda Fabia Mk1 1.2 HTP 40 kW AWY or BMD as explicitly listed; confirm engine code and current supersession, excludes other 1.2 and all 1.4 branches F…
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Sources for this issue (2)
Same EA111 1.2 TSI timing chain tensioner defect as Octavia (above) — affects Mk2 (2010-2014) and early Mk3 (2014-2017) Fabia. Tensioner cannot hold pressure during cold start. Often slightly more prevalent on Fabia due to short-trip city use pattern typical of this segment.
Common Symptoms
- Cold-start rattle from front of engine
- Misfires
- Cam-crank correlation codes
- Severe cases: bent valves and no compression
How to Fix
Same as Octavia — full timing chain kit replacement with updated INA tensioner. €1,000-€1,800 in EU.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Volkswagen Group 03F198158B complete 1.2 TSI timing-chain kit
replace the diagnosed complete timing set on the duplicate EA111 repair card Fitment/availability: 2010-2014 Skoda Fabia II 1.2 TSI EA111 CBZA or CBZB; confirm engine code and OE supersession, exclude later belt-driven EA211 Fitment/avai…
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Mk2 and early Mk3 Octavias with the EA111 1.2 TSI (CBZA/CBZB) and 1.4 TSI Twincharger (CAVD/CTHE) engines suffer premature timing chain tensioner failure. The tensioner cannot maintain pressure during cold starts and shutdowns, causing the chain to slap, jump teeth, or in severe cases damage valves. Common in the 50,000-80,000 mi window. Same defect affects VW Polo/Golf/Touran, Seat Ibiza/Leon, Audi A1 with these engines. VW Group issued service campaign 13D2 for tensioner replacement on some VINs.
Common Symptoms
- Rattling noise from front of engine on cold start
- Misfires P0301-P0304
- Cam-crank correlation codes P0011/P0014/P0016
- Loss of compression
- Engine refuses to start
How to Fix
Replace timing chain, tensioner (updated INA part), guides, and idler. Cost €1,200-€2,000 in EU (£1,000-£1,800 UK). If chain has jumped causing valve damage, full top-end rebuild required (€3,500+). Check oil at every fuel stop on affected models.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Skoda 03F198158B 1.2 TSI timing set
replace the diagnosed complete CBZB timing-chain system Fitment/availability: Skoda Octavia II 1.2 TSI 77 kW CBZB from 02/2010 through 04/2013 as explicitly listed; confirm engine code and VIN, excludes EA211 belt engines Fitment/availab…
- EngineTeam 03C198229C complete 1.4 TSI timing set
replace the complete diagnosed CAXA chain system with the matched chain, tensioner, guides and sprockets Fitment/availability: Skoda Octavia II 1.4 TSI 90 kW CAXA from 11/2008 through 06/2013 as explicitly listed; confirm VIN and engine …
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P0303 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 P0303 mean on a Skoda?
P0303 stands for "Cylinder 3 Misfire Detected." This code means your engine's computer detected a misfire specifically in cylinder number 3 — that cylinder isn't burning its fuel-air mixture properly or completely. The computer senses misfires by watching for tiny fluctuations in crankshaft speed each time a cylinder is supposed to fire. A misfire wastes fuel, can cause a noticeable shake, rough idle or loss of power, and can flood raw fuel into the exhaust where it may overheat and damage the catalytic converter. Because the fault is isolated to one cylinder, the cause is usually something specific to that cylinder's ignition, fuel delivery, or compression. On Skoda it is documented across 2 models: Fabia, Octavia.
What are the most common causes of P0303?
The most common causes of P0303 are: Worn or fouled spark plug in cylinder 3, Failed or weak ignition coil on cylinder 3, Bad spark plug wire or boot (where applicable), Clogged or leaking fuel injector for cylinder 3, Vacuum or intake air leak affecting that cylinder, Low compression (worn rings, burnt/leaking valve, head gasket), Wiring or connector fault at the coil or injector. The specific cause varies by vehicle.
How much does it cost to fix P0303 on a Skoda?
Published repair estimates on Skoda range from $60 to $3,500 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 P0303 on a different make?
View P0303 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.