P0302 on Mercedes-Benz
Cylinder 2 Misfire Detected
P0302 on Mercedes-Benz vehicles indicates cylinder 2 misfire detected. Au7o has documented this code across 1 Mercedes-Benz model — most commonly on A-Class. 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 Mercedes-Benz range from $300 to $700, 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 Mercedes-Benz by Model
Mercedes-Benz A-Class(1 issue)
- M282 1.3L Intake Valve Carbon Buildup2019-2023
The 1.3L turbocharged direct-injection M282 engine (co-developed with Renault, used in A180/A200) suffers carbon deposit buildup on the intake valves and ports because direct injection does not wash the valve backs with fuel. On urban/short-trip duty cycles deposits accumulate from roughly 60,000 miles, causing rough running and hesitation.
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View P0302 across all makes →Frequently Asked Questions
What does P0302 mean on Mercedes-Benz?▼
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 Mercedes-Benz specifically, this code is documented across 1 model.
What causes P0302 on Mercedes-Benz vehicles?▼
Common causes on Mercedes-Benz: 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 Mercedes-Benz?▼
Repair costs on Mercedes-Benz range from $300 to $700, depending on the specific model and root cause.
Which Mercedes-Benz models have P0302 documented?▼
Au7o has documented P0302 on 1 Mercedes-Benz model: A-Class.