P0308 — Cylinder 8 Misfire Detected

P0308 means cylinder 8 misfire detected. Cylinder 8 isn't firing properly (V8 engines). Same drill: inspect the plug, coil, and injector for cylinder 8.

Fix soon

Drive gently and get it diagnosed within days.

What it means

Cylinder 8 isn't firing properly (V8 engines). Same drill: inspect the plug, coil, and injector for cylinder 8.

Most likely causes, ranked

  1. Worn spark plug in cylinder 8

    Most likely.

  2. Failing ignition coil on cylinder 8

    Common failure point.

  3. Clogged fuel injector

    Fuel starvation.

  4. Low compression

    Mechanical.

  5. Vacuum leak

    Lean misfire.

Typical repair cost

Typically $100–$500

Single plug/coil typically $100–$300; injector work typically $150–$400. Estimates vary by vehicle. Costs are estimates and vary by vehicle, location, and shop.

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Common questions

Is P0308 serious?

Okay short-term; fix within days to save the converter.

How much does it cost to fix P0308?

Typically $100–$500. Single plug/coil typically $100–$300; injector work typically $150–$400. Estimates vary by vehicle.

Can I drive with P0308?

Drive gently and get it diagnosed within days.

What causes P0308?

The most common cause is worn spark plug in cylinder 8. Most likely.

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