Ford Focus: Common Problems, Fault Codes & Repairs Everything for the Ford Focus in one place — its common problems and reliability, the fault codes owners see most, and the tools to diagnose them. Ford Focus fault codes Ford Focus P0300 Ford Focus specs & capacities Ford Focus — Fuse box location & guideFord Focus — Oil capacity & typeFord Focus — Tire pressureFord Focus — Bolt pattern & wheel sizes Recommended tools Automotive MultimeterCompression TesterBattery & Charging System Tester Read your code: OBD-II scanners →