Posted on 9/23/2025
Seeing your Hyundai’s check engine light flicker on can turn a calm drive into a moment of stress. While it’s tempting to ignore the warning, that little amber light is your car’s way of asking for help. At Oceanworks, the premier Berkeley auto repair shop, we’ve helped countless Hyundai owners understand what’s behind that glow — and how to fix it before it becomes a bigger problem. The check engine light can point to a wide range of issues, from something as simple as a loose gas cap to something as serious (and expensive to fix) as a failing catalytic converter. Many Hyundai drivers encounter OBD-II codes such as: P0171 – System Too Lean (often linked to a vacuum leak or faulty mass airflow sensor) P0300 – Random/Multiple Cylinder Misfire Detected P0420 – Catalyst System Efficiency Below Threshold (commonly a catalytic converter or oxygen sensor issue) P0456 – Evaporative Emission System Small Leak (sometimes jus ... read more