How much does it cost to fix P0300?

Typical repair cost is $100–$900.

P0300 — Random/Multiple Cylinder Misfire Detected

High Severity · Engine

OBD-II code P0300 means your vehicle's ECU detected: Random/Multiple Cylinder Misfire Detected. Below: causes, step-by-step fixes, and repair cost — free, no signup needed.

High severity — do not ignore. Get a diagnosis promptly to avoid further engine damage.

Typical Repair Cost

$100–$900

Parts + labor, national average

Severity

High

Address as soon as possible

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Common Causes of P0300

Worn spark plugs
Bad ignition coils
Clogged fuel injectors
Low compression
Vacuum leak

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How to Fix Code P0300

Replace spark plugs (most common fix — ~$50–$150)

Test and replace faulty ignition coil (~$80–$300)

Clean or replace fuel injectors (~$150–$400)

Check for vacuum leaks with smoke test

Compression test to rule out internal engine damage

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FAQ — Code P0300

What does OBD-II code P0300 mean?

P0300 means your vehicle's onboard computer detected: Random/Multiple Cylinder Misfire Detected. This is a high-severity code in the Engine category.

How much does it cost to fix code P0300?

Typical repair cost for P0300 is $100–$900 including parts and labor. Costs vary by vehicle make, model, and location. A free scan at AutoZone or O'Reilly is a good first step.

Can I drive my car with code P0300?

Code P0300 is high severity. Avoid long drives until diagnosed — continued driving can cause additional engine damage.

What are the most common causes of P0300?

The most common causes are: Worn spark plugs, Bad ignition coils, Clogged fuel injectors, Low compression, Vacuum leak. Always start with the cheapest diagnosis step before replacing parts.

Will code P0300 clear itself?

Code P0300 will clear itself after the underlying issue is fixed and the ECU completes several successful drive cycles. Clearing it without fixing the root cause only masks the problem temporarily.

Is P0300 showing on your car?

Enter your VIN for a free vehicle-specific report — recalls, specs, and market value. No signup required.

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OBD-II code data is based on SAE J2012 standards and general repair industry data. Repair costs are national averages and vary by vehicle, location, and shop. Always consult a qualified mechanic for a diagnosis specific to your vehicle.