Mercedes Benz

Okay, let's break down the **P0442: Fuel Tank Ventilation System (Micro-Leak)** code. This OBD-II trouble code indicates a specific issue with your vehicle's Evaporative Emission Control System (EVAP) – particularly related to the fuel tank ventilation system. Here's what it generally means: ### P0442 Code Meaning The **P0442** code is triggered by the car's onboard computer when there's an issue with the EVAP system pressure being too low, but not necessarily due to a major leak. It indicates that the fuel tank ventilation system has detected a condition where it cannot properly monitor or seal its operation. ### Key Points These codes are particularly serious because they relate directly to your car's emission control systems and components like catalytic converters. When you mentioned "**Fuel Tank Ventilation System – Conversion Efficiency**", I'll focus on explaining that this code typically relates to leaks or system efficiency issues, but not...