P0302 on SEAT
Cylinder 2 Misfire Detected
P0302 on SEAT vehicles indicates cylinder 2 misfire detected. Au7o has documented this code across 1 SEAT model — most commonly on Leon. This code means the engine computer has detected a misfire specifically in cylinder 2, meaning that cylinder isn't completing combustion properly on some firing events. The computer watches tiny variations in crankshaft speed to spot when a cylinder fails to fire, and a misfire means the air-fuel mixture isn't igniting correctly — usually from a spark, fuel, or compression problem in that cylinder. You may feel a stumble, rough idle, shaking, loss of power, or a flashing check-engine light, and persistent misfires can damage the catalytic converter. Because it names a single cylinder, the fault is often a component serving just cylinder 2, like its coil, plug, or injector. Typical repair costs on SEAT range from $300 to $1,200, depending on the specific model and root cause.
Common Causes of P0302
- •Worn or fouled spark plug (cylinder 2)
- •Failed ignition coil or coil-on-plug (cylinder 2)
- •Clogged or faulty fuel injector (cylinder 2)
- •Vacuum or intake air leak affecting that cylinder
- •Low compression (worn rings, burnt/bent valve, head gasket)
- •Damaged spark plug wire or boot (if equipped)
- •Carbon-tracked or cracked coil/plug causing spark loss
- •Faulty PCM/ECM driver (rare)
P0302 on SEAT by Model
SEAT Leon(2 issues)
- Leon Mk3 2.0 TSI (EA888 Gen 3) Intake Valve Carbon Buildup2012-2020
Direct-injection EA888 Gen 3 2.0 TSI engines (Leon Cupra, Tiguan, Golf R) accumulate carbon on intake valves because fuel never washes the valves — port injection (which detergent fuels would clean) is absent. Symptoms appear 80,000-130,000 km: rough idle, misfire codes, reduced economy, sometimes failed emissions tests.
- 1.8/2.0 TSI (EA888) Oil Consumption and Intake-Valve Carbon Buildup2009-2020
FR and Cupra Leons with the 1.8 and 2.0 TSI/TFSI EA888 engines are documented for two related issues. Earlier EA888 (Gen 2) variants are notorious for high oil consumption from weak/under-tensioned piston rings and PCV issues; Gen 3 reduced but did not eliminate it. Separately, because these are direct-injection engines, fuel never washes the intake valves, so carbon builds up on the valve backs over time, causing rough idle, misfires and reduced performance - a recognised characteristic of the platform on higher-mileage cars.
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View P0302 across all makes →Frequently Asked Questions
What does P0302 mean on SEAT?▼
P0302 stands for "Cylinder 2 Misfire Detected." This code means the engine computer has detected a misfire specifically in cylinder 2, meaning that cylinder isn't completing combustion properly on some firing events. The computer watches tiny variations in crankshaft speed to spot when a cylinder fails to fire, and a misfire means the air-fuel mixture isn't igniting correctly — usually from a spark, fuel, or compression problem in that cylinder. You may feel a stumble, rough idle, shaking, loss of power, or a flashing check-engine light, and persistent misfires can damage the catalytic converter. Because it names a single cylinder, the fault is often a component serving just cylinder 2, like its coil, plug, or injector. On SEAT specifically, this code is documented across 1 model.
What causes P0302 on SEAT vehicles?▼
Common causes on SEAT: Worn or fouled spark plug (cylinder 2), Failed ignition coil or coil-on-plug (cylinder 2), Clogged or faulty fuel injector (cylinder 2), Vacuum or intake air leak affecting that cylinder, Low compression (worn rings, burnt/bent valve, head gasket). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0302 on a SEAT?▼
Repair costs on SEAT range from $300 to $1,200, depending on the specific model and root cause.
Which SEAT models have P0302 documented?▼
Au7o has documented P0302 on 1 SEAT model: Leon.