2010 Mazda P0306: What It Means & Is It Safe to Drive?
P0306 on the 2010 Mazda: Cylinder 6 Misfire Detected. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
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What this code means
Misfire on cylinder 6, found on V6 and V8 engines. On transversely-mounted V6 engines the rear bank cylinders (including cylinder 6) often have higher labor costs due to access difficulty.
Common causes on the 2010 Mazda
- Worn spark plug on cylinder 6
- Failed coil-on-plug
- Fuel injector fault
- Low compression
Symptoms
- Check Engine Light, may flash under load
- Rough idle or vibration
- Hesitation and power loss
Typical fixes
- Replace spark plug and COP coil on cylinder 6
- Replace or clean injector on cylinder 6
- Compression and leak-down test if no improvement
Repair cost range
For a 2010 Mazda, repairs for P0306 typically fall between $150 and $1200, depending on the root cause and labor rates in your area.
Known issues on Mazda
Mazda V6 P0306 follows standard COP misfire diagnosis. On AJ-series V6 engines, rear-bank coil boots can crack and cause carbon-tracking arc to ground. Replace both the coil and boot if carbon tracking is visible.
Most commonly affected models
Mazda6 V6 2.3L 2003–2008MPV V6 3.0L 2000–2006CX-9 V6 2007–2015