P0303 on Land Rover: How to Diagnose & Fix
Cylinder 3 Misfire Detected
1 Land Rover model · 1 documented issue · 1 critical · $1,500-$3,500 repair
P0303 on Land Rover by model: symptoms, diagnosis and fix
The Rover KV6 2.5L V6 engine used in the Freelander is notorious for head gasket failure. The V6 design uses two head gaskets (front and rear banks) and the rear bank is particularly prone to failure. The aluminum heads warp from overheating, and the original gaskets deteriorate. Head gasket failure causes coolant and oil mixing, overheating, and eventual engine destruction if not addressed. This is the single most well-known Freelander issue.
Common Symptoms
- Overheating especially in traffic
- White smoke from exhaust
- Milky residue under oil filler cap
- Coolant loss with no visible leak
- Oil in coolant or coolant in oil
- Rough running and misfires
How to Fix
Replace both head gaskets with the updated multi-layer steel (MLS) design. Have both cylinder heads pressure-tested and skimmed for flatness. Replace the head bolts (they are torque-to-yield and cannot be reused). Also replace the thermostat and water pump while the engine is apart. Consider installing an aluminum radiator to prevent future overheating.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- ZUA001480 KV6 cylinder-head-gasket overhaul kitOEMZUA001480
Verify build details and all ancillary seals before teardown.
- LDN10027P1SET KV6 cylinder-head bolt setOEMLDN10027P1SET
Replace the full engine set of 16 KV6 stretch head bolts Fitment/availability: Freelander 1 2.5 KV6 petrol; one engine set.
- PEM000030PK complete KV6 thermostat and pipe kitOEMPEM000030PK
Renew a leaking or degraded thermostat assembly and the failure-prone connecting pipes during the cooling repair Fitment/availability: Freelander 1 2.5 KV6 petrol; includes thermostat, angled and straight coolant pipes, manifold gaskets …
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Owner tips & cautions
- WarningIf you are buying a Freelander with the V6, check for head gasket failure BEFORE purchase. Budget $2,000-3,000 for the repair if it has not been done.
Sources for this issue (6)
- MG-Rover: Land Rover Freelander V6 head gasket failureforum
- Freelander Specialist: Freelander 2.5 Petrol K V6 Head Gasket Replacementmanufacturer
- LandyZone: KV6 engine reliability after re-designforum
- LandyZone: Freelander 1 KV6 Head Gasket failureforum
- Land Rovers Only: 2003 Freelander KV6 2.5 blown head gasket repairforum
- LandyZone: 2001 Freelander 2.5KV6 troubles?forum
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 Land Rover?
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 Land Rover it is documented across 1 model: Freelander.
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 Land Rover?
Published repair estimates on Land Rover range from $1,500 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.