Mercedes-Benz CLK320 'Check Gas Cap' Warning Light with Possible Evap System Leak on Mercedes-Benz CLK320

Some Mercedes-Benz CLK320 owners report experiencing issues related to the 'Check Gas Cap' warning light, which may indicate a possible Evaporative Emission Control System (EVAP) leak. This warning can be triggered by a loose or improperly fitted gas cap, potentially causing a code for a large leak in the fuel evaporative system and leading to the check engine light illuminating. Additionally, some owners notice that when the low fuel light flashes alongside the 'Check Gas Cap' warning, it suggests a detected leak in the EVAP system, which could originate from various components like hoses or pipes. In certain cases, simply replacing the gas cap seal does not resolve the issue, as a broken hose in the fuel filter neck may be the underlying cause of a recurring P0442 code. Symptoms of an EVAP system leak can include the illumination of the check engine light, the gas cap warning light, and the presence of fuel vapors. Owners are advised to thoroughly inspect components around the fuel tank and engine bay to troubleshoot these issues effectively.