Posted on 7/8/2026
Catalytic converters have no moving parts, so they rarely fail. But catalytic converter failure is a possibility – whether due to engine misfires, coolant leaks, leaky fuel injectors, burned engine oil, bad oxygen sensor, or physical damage, to name some of the major culprits. A failing catalytic converter can negatively impact your Mercedes in a variety of ways: performance will suffer, you may notice unusual odors, including the rotten eggs smell, rattling noises, and the check engine light will be illuminated. We highly recommend contacting MB Clinic in Denver to inspect and diagnose the cause of these symptoms as soon as possible. Continued driving with a failed catalytic converter can cause serious engine damage, and in some, fortunately very rare cases, can result in a vehicle fire. Catalytic converters reduce harmful emissions by converting engine exhaust gases (carbon monoxide, hydrocarbons, and nitrogen oxides) into carbon dioxide, nitrogen, oxygen and water vap ... read more
Posted on 10/12/2025
Your Mercedes is a marvel of modern engineering, yet occasionally it will require help. When the Mercedes onboard computer illuminates the “check engine light” warning on the dashboard, it’s your vehicle asking for help. There are literally thousands of conditions that can cause the check engine light to come “on”. Fortunately, not all require extensive diagnostics or time-consuming repairs. The simplest, and easiest to correct cause of the check engine light is a faulty gas cap – so gas cap replacement is all that’s needed. But more often than not, there will be diagnostics involved, and a repair to me made. Here are top 10 most frequent reasons for the Mercedes check engine light, in no particular order: Faulty oxygen sensor Worn spark plugs Failing ignition coils Loose or cracked gas cap Failing catalytic converter Mass Air Flow (MAF) sensor malfunctioning Emission system problems (EVAP sensor, EGR valve) Transmission problems Ele ... read more