P0301 Toyota Rav4
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 Toyota Rav4 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 Toyota Rav4.
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 Toyota Rav4.
Common Causes on Toyota Rav4
- Ignition coil failure on cylinder 1 on 2.5L or 3.5L V6
- Spark plug worn or fouled on high-mileage engine
- Fuel injector partially clogged reducing fuel delivery to cylinder 1
- Intake valve carbon deposits on direct injection 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 Toyota Rav4
RAV4/Highlander coil failures are rare but do occur; plug replacement at 100K is critical.