P0303 on Suzuki
Cylinder 3 Misfire Detected
P0303 on Suzuki vehicles indicates cylinder 3 misfire detected. Au7o has documented this code across 1 Suzuki model — most commonly on Alto. 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. Typical repair costs on Suzuki range from $200 to $1,200, depending on the specific model and root cause.
Common Causes of P0303
- •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
P0303 on Suzuki by Model
Suzuki Alto(1 issue)
- Alto / Wagon R K10B Valve Clearance Service (Shim-Under-Bucket)2009-2020
The K10B 1.0 3-cylinder in Alto, Celerio (early), Splash, and Wagon R uses shim-under-bucket valve adjustment — not the more common hydraulic lash adjusters. Suzuki specifies a check at 96,000 km but many owners (and dealers) skip it; tight valves over time cause burned exhaust valves and failed compression.
Looking for P0303 on a different make?
View P0303 across all makes →Frequently Asked Questions
What does P0303 mean on Suzuki?▼
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 Suzuki specifically, this code is documented across 1 model.
What causes P0303 on Suzuki vehicles?▼
Common causes on Suzuki: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0303 on a Suzuki?▼
Repair costs on Suzuki range from $200 to $1,200, depending on the specific model and root cause.
Which Suzuki models have P0303 documented?▼
Au7o has documented P0303 on 1 Suzuki model: Alto.