P0303 2017 Toyota RAV4 Code - Cylinder 3 Misfire Detected

P0303 indicates a misfire has been detected in cylinder 3 of your engine.

Symptoms include rough idling, reduced engine performance, poor fuel economy, and the Check Engine Light turning on.

Common causes include a faulty spark plug, a malfunctioning ignition coil, clogged fuel injector, vacuum leak, or low compression in cylinder 3.

Driving with a P0303 code can damage the engine over time. It’s best to address the issue promptly to avoid further complications.

Start by inspecting and replacing the spark plug and ignition coil for cylinder 3. If the issue persists, check the fuel injector, wiring, or perform a compression test.

Repair costs can vary between $100 to $400, depending on whether you need to replace spark plugs, ignition coils, or fuel injectors.

While unlikely, a severely dirty air filter can disrupt airflow and contribute to misfires, but it’s typically not the primary cause.

Use an OBDII scanner to confirm the code, then inspect the spark plug, ignition coil, and fuel injector for cylinder 3. Perform a compression test if necessary.

Clearing the code won’t fix the underlying issue. The misfire needs to be diagnosed and repaired to prevent the code from returning.

Yes, contaminated or low-quality fuel can lead to misfires, but it’s essential to rule out other causes like ignition or injector problems first.