P0301 2013 Toyota RAV4 Code - Cylinder 1 Misfire Detected

P0301 indicates that the engine control module (ECM) has detected a misfire in cylinder 1.

Symptoms include rough idling, loss of power, poor fuel economy, engine shaking, and the check engine light turning on.

Causes can include a faulty spark plug, a malfunctioning ignition coil, a clogged fuel injector, vacuum leaks, or low engine compression in cylinder 1.

Driving with a P0301 code is not recommended as it can lead to further engine damage or catalytic converter failure if the misfire persists.

Common fixes include replacing the spark plug or ignition coil for cylinder 1, cleaning or replacing the fuel injector, and checking for vacuum leaks or compression issues.

Diagnosis involves inspecting the cylinder 1 spark plug and ignition coil, performing a fuel injector test, checking for vacuum leaks, and conducting a compression test.

While unlikely, a severely clogged air filter can contribute to engine misfires and should be inspected as part of routine maintenance.

Repair costs vary but typically range from $100 to $300 for spark plug or ignition coil replacement, with higher costs if fuel injectors or compression issues are involved.

Yes, contaminated or low-quality fuel can cause misfires and trigger a P0301 code by affecting cylinder 1’s combustion process.

Clearing the code may turn off the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.