What does code P0300 mean on a Mini and is it safe to drive?
P0300: Random/Multiple Cylinder Misfire Detected. Here's what it means on your Mini, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
The PCM has detected misfires across multiple cylinders. This can cause damage to the catalytic converter if driven for long.
Common causes for your Mini
- Worn spark plugs or ignition coils
- Clogged or bad fuel injectors
- Low compression
- Vacuum leak, bad MAF, or fuel delivery issue
Symptoms
- Check Engine Light (often flashing under load)
- Rough idle, shaking, loss of power
- Possible smell of unburned fuel
Typical fixes
- Replace spark plugs and coils as needed
- Clean or replace fuel injectors
- Fix vacuum/fuel issues
- Compression test if no obvious cause
Repair cost range
For a Mini, repairs for P0300 often fall between $150 and $1200, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Mini
MINI Cooper S P0300 on the N14 and N18 turbocharged 4-cylinder often stems from walnut-sized carbon deposits on intake valves or failing ignition coils. The N14 also has a timing chain tensioner issue at high mileage that can cause misfire-like symptoms.
Most commonly affected models
Cooper S 2007–2014Countryman S 2011–2016Clubman S 2008–2014