P0301 Mazda Cx-5
Cylinder 1 Misfire Detected · Powertrain Code · High · Repair: Easy
What is P0301?
Misfire detected in cylinder 1. Typically caused by a worn spark plug, bad ignition coil, faulty fuel injector, or low compression in that cylinder.
When the Mazda Cx-5 triggers code P0301 (cylinder 1 misfire detected), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Mazda Cx-5.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Mazda Cx-5.
Common Causes on Mazda Cx-5
- Ignition coil failure on cylinder 1 on 2.5L Skyactiv-G
- Spark plug worn from high-compression Skyactiv engine operation
- Fuel injector partially clogged from carbon deposit buildup
- Intake valve carbon deposits on direct injection Skyactiv engines
Symptoms
- Rough idle with noticeable engine vibration
- Engine shaking or vibration especially at idle
- Loss of power during acceleration
- Check engine light flashing (indicating catalytic converter damage risk)
- Poor fuel economy from unburned fuel
- Unburned fuel smell from exhaust
Notes for Mazda Cx-5
Mazda Skyactiv high-compression engines are sensitive to spark plug condition; replace at 60K miles.