P0308 on Jaguar
Cylinder 8 Misfire Detected
P0308 on Jaguar vehicles indicates cylinder 8 misfire detected. Au7o has documented this code across 1 Jaguar model — most commonly on XK. P0308 means the engine computer detected a misfire on cylinder number 8 — that cylinder is failing to combust properly or at the correct time. The PCM identifies it by monitoring crankshaft speed variations as cylinder 8 fires. Misfires waste fuel, increase emissions, and can overheat and damage the catalytic converter, so a hard misfire may cause a flashing check engine light. Typical symptoms include rough idle, vibration, hesitation, and reduced power. Typical repair costs on Jaguar range from $300 to $1,000, depending on the specific model and root cause.
Common Causes of P0308
- •Worn, fouled, or incorrectly gapped spark plug on cylinder 8
- •Failed ignition coil or coil-on-plug for cylinder 8
- •Faulty, clogged, or leaking fuel injector
- •Vacuum or intake air leak affecting that cylinder
- •Low compression (worn rings, burnt/leaking valve, head gasket)
- •Damaged spark plug wire or boot (on applicable engines)
- •Carbon buildup or sticking valve
P0308 on Jaguar by Model
Jaguar XK(1 issue)
- Ignition Coil-on-Plug Misfire (Oil-Fouled Coils)2007-2015
The AJ-V8 uses individual coil-on-plug ignition coils that fail with age and heat, producing single- or multi-cylinder misfires and a check-engine light. A frequent contributor is oil pooling in the spark-plug wells from a leaking cam-cover gasket, which fouls the coil boots. Coils typically last 70k-100k miles but wear faster with heavy idling and heat cycling.
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View P0308 across all makes →Frequently Asked Questions
What does P0308 mean on Jaguar?▼
P0308 stands for "Cylinder 8 Misfire Detected." P0308 means the engine computer detected a misfire on cylinder number 8 — that cylinder is failing to combust properly or at the correct time. The PCM identifies it by monitoring crankshaft speed variations as cylinder 8 fires. Misfires waste fuel, increase emissions, and can overheat and damage the catalytic converter, so a hard misfire may cause a flashing check engine light. Typical symptoms include rough idle, vibration, hesitation, and reduced power. On Jaguar specifically, this code is documented across 1 model.
What causes P0308 on Jaguar vehicles?▼
Common causes on Jaguar: Worn, fouled, or incorrectly gapped spark plug on cylinder 8, Failed ignition coil or coil-on-plug for cylinder 8, Faulty, clogged, or leaking fuel injector, Vacuum or intake air leak affecting that cylinder, Low compression (worn rings, burnt/leaking valve, head gasket). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0308 on a Jaguar?▼
Repair costs on Jaguar range from $300 to $1,000, depending on the specific model and root cause.
Which Jaguar models have P0308 documented?▼
Au7o has documented P0308 on 1 Jaguar model: XK.