OBD2 Info Guides

Quick Answer P0304 means your vehicle’s computer detected a misfire in cylinder 4. Common P0304 causes include a worn spark…

Quick Answer Common P0304 symptoms include rough idling, engine shaking, hesitation, weak acceleration, reduced fuel economy, hard starting, and an…

Quick Answer P0304 means your vehicle’s engine computer has detected a misfire in cylinder 4. The problem may come from…

Quick Answer P0303 repair cost commonly falls around $150 to $1,200 when the cause is a spark plug, ignition coil,…

Quick Answer To fix P0303, first confirm that cylinder 3 is misfiring, then test the ignition, fuel, air, and mechanical…

Quick Answer P0303 means the engine computer detected a misfire in cylinder 3. Common P0303 causes include a worn spark…

A code reader helps us find the cause of a check engine light without visiting a repair shop first. These…

A Toyota Camry can develop warning lights, rough performance, or starting problems without an obvious cause. An OBD2 scanner connects…

A code reader can help us understand why a Honda Civic’s warning light came on. These compact tools connect to…

An OBD2 scanner helps us read the diagnostic trouble codes stored by a car’s computer. For Civic owners, it can…

A code reader is a small diagnostic tool that connects to a vehicle’s computer and shows trouble codes linked to…

Quick Answer P0402 means the engine computer has detected more exhaust gas recirculation, or EGR flow, than expected. Common P0402…

Quick Answer A P0401 repair can range from a relatively inexpensive cleaning or hose repair to several hundred dollars for…

Quick Answer P0402 means the engine computer has detected more exhaust gas recirculation, or EGR, flow than expected. A stuck-open…

Quick Answer To fix P0401, first confirm the code and freeze-frame data with an OBD2 scanner, then inspect the EGR…