P0301 on Saab
Cylinder 1 Misfire Detected
P0301 on Saab vehicles indicates cylinder 1 misfire detected. Au7o has documented this code across 2 Saab models — most commonly on 9-3, 9-5. P0301 means the engine computer detected a misfire specifically in cylinder 1 — the spark didn't ignite the fuel properly, or the fuel/air mix didn't burn as it should. The computer detects this by sensing tiny variations in crankshaft speed each time a cylinder fires. A misfire wastes fuel, raises emissions, and can damage the catalytic converter if it's severe or persistent (a flashing check engine light usually warns of active, converter-damaging misfires). Because the code points to one specific cylinder, the cause is usually an ignition, fuel, or compression problem isolated to that cylinder. Typical repair costs on Saab range from $80 to $600, depending on the specific model and root cause.
Common Causes of P0301
- •Worn or fouled spark plug in cylinder 1
- •Failed ignition coil or coil pack for cylinder 1
- •Faulty or clogged fuel injector for cylinder 1
- •Vacuum or intake air leak affecting that cylinder
- •Bad spark plug wire (on applicable engines)
- •Low compression (worn rings, leaking or burnt valve, head gasket)
- •Carbon buildup on intake valves
- •Wiring or connector fault to the coil or injector
P0301 on Saab by Model
Saab 9-3(1 issue)
- 9-3 Direct Ignition Cassette (DIC) Failure1999-2011
The Saab Direct Ignition Cassette — single integrated unit covering all four spark plugs — is a well-known wear item across 9-3 (and 9-5) from 1999 through end of production. Symptoms: misfire (often cylinder-specific then random), reduced power, check engine light. Failure rate climbs sharply after 80,000 miles. Saab DIC heat-shielding cracks; rubber boots fail.
Saab 9-5(2 issues)
- 9-5 Direct Ignition Cassette (DIC) Failure1999-2009
Same DIC failure mode as 9-3 — 1999-2009 9-5 with the B235 2.3L turbo (Linear/Arc/Vector NA variants are B205) suffers DIC degradation. Saab dealers used to stock these by the dozen. Often the first part to fail on a high-mileage 9-5.
- Direct Ignition Cassette (DIC) Failure1999-2009
The Direct Ignition Cassette, which sits directly on top of the spark plugs and combines the coils into one unit, is a frequent failure point on the four-cylinder cars. Underhood heat and valve-cover gasket oil leaks contaminating the coil pack degrade the cassette over time, causing misfires, rough idle, hard starting and stalling. A failed cassette typically has a burnt smell and discoloration around the plug boots.
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View P0301 across all makes →Frequently Asked Questions
What does P0301 mean on Saab?▼
P0301 stands for "Cylinder 1 Misfire Detected." P0301 means the engine computer detected a misfire specifically in cylinder 1 — the spark didn't ignite the fuel properly, or the fuel/air mix didn't burn as it should. The computer detects this by sensing tiny variations in crankshaft speed each time a cylinder fires. A misfire wastes fuel, raises emissions, and can damage the catalytic converter if it's severe or persistent (a flashing check engine light usually warns of active, converter-damaging misfires). Because the code points to one specific cylinder, the cause is usually an ignition, fuel, or compression problem isolated to that cylinder. On Saab specifically, this code is documented across 2 models.
What causes P0301 on Saab vehicles?▼
Common causes on Saab: Worn or fouled spark plug in cylinder 1, Failed ignition coil or coil pack for cylinder 1, Faulty or clogged fuel injector for cylinder 1, Vacuum or intake air leak affecting that cylinder, Bad spark plug wire (on applicable engines). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0301 on a Saab?▼
Repair costs on Saab range from $80 to $600, depending on the specific model and root cause.
Which Saab models have P0301 documented?▼
Au7o has documented P0301 on 2 Saab models: 9-3, 9-5.