On an electric or hybrid Mercedes, regenerative braking (Mercedes calls it recuperation) works by running the electric motor as a generator when you lift off the accelerator or press the brake. The wheels turn the motor, the motor slows the car, and the electricity it makes goes back into the high-voltage battery …

A failing NOx sensor on a Mercedes-Benz diesel shows up as a check engine light, higher fuel use, rough idle, jerky acceleration and, in the end, a failed emissions test. The usual causes are soot build-up on the probe and burnt or damaged wiring. The fix is to read the fault codes with a scan tool, inspect the sensor …

If your OBD2 scanner won't turn on or won't read OBD (on-board diagnostic) codes, the cause is usually the car, not the scanner. Check these in order: the fuse that powers the OBD socket (often shared with the 12-volt socket or cigarette lighter), the ignition in the "run" position, about 12 volts between pin …

To lower a Mercedes with Airmatic air suspension using OBD2, you plug a lowering module into the car's OBD2 port with the ignition on and the engine off, pick Factory, Low (-32 mm) or Custom on the screen, save, unplug the module and switch the ignition off. The car settles at the new ride height the next time you …

To install an Android head unit in an older Mercedes-Benz, disconnect the battery, take out the center console, remove the radio and the original screen (each held by 2 Torx 20 screws), connect the kit's harness to the original wiring, refit the radio, fit the new display in its bracket, test it, and put the trim back. …

When Mercedes me pre-climate control does not work, it is most often a communication problem between the app and the car. Start the car manually, switch it off, get out and try again from the app. If that fails, check that the climate settings on the infotainment screen have not been erased, check that the feature is …

To reset a Mercedes automatic transmission (the adaptive shift values stored in the transmission control unit), turn the key to position 2 without starting the engine, press the accelerator fully to the floor for 15 seconds, turn the key back to position 1 while still holding the pedal, release the pedal, and wait …

Your Mercedes has two kinds of QR code. The first is the rescue sticker: since 2013 Mercedes-Benz puts one on the fuel tank flap and one on the B-pillar on the opposite side, and scanning it opens the rescue sheet for that model. The second appears on the screen of MBUX-equipped cars: you scan it with the Mercedes me …

When Mercedes me remote start fails, it is almost never a mechanical problem. The cause is usually one of four things: a communication issue between the app and the car, the app itself showing a black or blank screen, a loading or server error, or remote services that have expired after the complimentary trial. Start …

The Mercedes heads-up display (HUD) projects information such as your speed and navigation arrows onto the windshield, in the driver's line of sight. On cars with MBUX you switch it on in the infotainment settings under Quick Access > HUD; on older cars (for example with COMAND) there is a button or dial under the …