MB Medic Mercedes-Benz Repair Guides, Service, How To DIY
Quick answer: A full system scan, or health check, reads the fault codes stored in every control module on your Mercedes-Benz, not just the engine. Plug a full system scanner such as the YOUCANIC UCAN-II Pro into the OBD2 port, switch the ignition on with the engine off, select Quick …
Read More »Mercedes AdBlue Problems: Warning Messages, Countdown to No Start, NOx and Level Sensor Faults on BlueTEC and Sprinter
AdBlue is just another name for Diesel Exhaust Fluid, or DEF. This solution of urea in water is injected into exhaust gases as part of the exhaust treatment system called selective catalytic reduction, or SCR. Watch: Mercedes-Benz Engine Start Not Possible in X Miles: AdBlue Warning This process converts up …
Read More »Mercedes Start/Stop Button Not Working: Push Button Start Will Not Crank, Key Not Recognized and the Emergency Key Override
There may come a day when the Start/Stop button on your Mercedes-Benz no longer starts the engine. This article covers the causes that stop a push button start from working, from a flat key fob to the electronic ignition switch, plus the emergency override that gets you moving in the …
Read More »Mercedes Auto Lamp Function Inoperative
You get into the car and start your Mercedes-Benz. Next, you are greeted with an “Auto Lamp Function Inoperative” error message on the dashboard. The message comes from the light and rain sensor at the base of the mirror, but the sensor itself is often not the faulty part. The …
Read More »Car Alarm Horn Goes Off Randomly
Is your car alarm going off for no reason? This article reviews the common issues that can cause a car alarm to go off randomly. Mercedes’s alarm may go off, even when no one tries to steal the car. We have seen many cases when a Mercedes alarm (siren) goes …
Read More »Mercedes Radar Sensor Problems & Solutions
The Mercedes-Benz radar system may malfunction and set errors in various Mercedes modules, including Parktronic System, Collision Prevention Assist Plus, Distronic Plus, autonomous driving, Active Brake Assist Cross Traffic, etc. The cameras and sensors could be defective, but often, such problems are caused by sensors being covered with dirt, ice, …
Read More »YOUCANIC UCAN-II Pro Review: Troubleshooting Mercedes-Benz Problems with a Full System Scanner
Owning a modern vehicle and not knowing how to use a diagnostic scanner is like having a smartphone (which you use to make phone calls) and not knowing that there is an Apple / Play store with many useful apps. A diagnostic scanner is necessary if you own a 2000 or newer …
Read More »Mysterious Mercedes Electrical Problems: Many Unrelated Faults at Once, Water in the Spare Wheel Well and the Clogged Trunk Drain Behind Them All
Recently, we have been working on a Mercedes-Benz with some major and unexplainable electrical issues. The problem started with the Keyless Go feature. The key would unlock the car via the key fob and start by inserting it in the ignition. But Keyless Go stopped working. Pressing the door handle …
Read More »Mercedes Codes P0170 and P0173 Fuel Trim Malfunction: Why the Mass Air Flow Sensor Is Usually the Cause, the Snap Test That Proves It, and What to Check Next
Mercedes-Benz owners may notice the check engine light plus P0170 and P0173 codes. Theoretically, these two codes mean the fuel mixture is too rich or too lean. Most of the time, these Mercedes-Benz fault codes are caused by a defective . You can try cleaning the sensor, but that doesn’t …
Read More »