How to replace left front parking lamp on 2008 Mercedes S 550

check e/parking brake is off -problem can be a few reasons this forum explains most https://mbworld.org/forums/s-class-w221/221407-first-problem-my-08-s63-any-s550-had.html

Clean plugs and bulb sockets and spray with DW 40 or similar. (dry connection). Otherwise there is faulty wire/s.

Park, Tail, Marker, and License Lamps
The PARK/LAMP fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to both the coil and switch sides of the PRK LAMP relay, also located in the I/P fuse block. When the headlamp switch is placed in either the PARK or HEAD position, ground is supplied to the BCM on the park lamp switch ON signal circuit. The BCM then applies a ground to the park lamp relay control circuit. This energizes the relay, applying voltage to all park, tail, marker, and license lamps. The park, tail, marker, and license lamps are also turned ON when the headlamps are commanded ON by the BCM for low light operation.
Ground for the headlamp switch is from G200. Grounds for the various lamps are as follows:
• G100 supplies the right front lamps
• G101 supplies the left front lamps
• G400 supplies the right rear lamps
• G401 supplies the left rear lamps

No relay for the parking lights .
When the headlamp switch is moved to the PARK or ON position, battery voltage is supplied from the 15A Park Lamp fuse to circuit 9. Current flows through circuit 9 to the instrument panel fuse block (IPFB). Battery power passes through the IPFB to both license lamps, both front and rear tail lamps, both front park/turn lamps, and all marker lamps through circuit 9. The front marker and front park/turn lamps are grounded by circuit 150 through the forward lamp ground splice pack. The rear tail lamps and license lamps are grounded by circuit 550 at the rear ground splice pack and the right rear body ground.

Is the socket 'burned' I think you can use the same repair kit for the E-class front park lamp repair on your S-class

Not sure I follow your story.
The front and rear turn signal should blink on one side. If the tail lamps are not working, it could be a fuse or a problem with the wiring. And the tail lamps are on the same circuit as the front parking lamps.

No that would not be it. Are you using the correct grade of a good quality name brand fuel?

It will turn on when I hit the button and the turn signals do work. All of this has led to my ABS lights to come on as well. ??????????? Your best bet , take it to a qualified repair shop or learn to do better explanation's ! Or lean to do automotive electrical testing .
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
Electric Testing Techniques You Need to Know

How to Use Multimeter to Troubleshoot Common Problems

Do you know what a wiring diagram is ? How to use a DVOM - digital volt ohm meter ? Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year make ,model and engine size. Under system click on lighting ,then under subsystem click on turn signals . Click the search button then the blue links .Check power an ground circuits ! This is how we diagnose electrical faults , not just replacing parts .

Turn Lamps
Voltage is applied through the TURN fuse and the turn/hazard flasher when the ignition switch is in the following positions:
• RUN
• BULB TEST
• START
The voltage travels to the contact in the hazard switch. The hazard switch is located in the turn/hazard-headlamp switch assembly. This contact is normally closed.
When the left turn signal is turned on, voltage is applied to the following components.
• The left turn indicator
• The left front park/turn lamp circuit 14
• The left rear turn lamp circuit 18
The turn lamps turn on immediately. The current flow heats up the timing element. The timing element is located in the turn/hazard flasher. The timing element repeatedly opens and closes the circuit. This action causes the turn lamps to begin flashing.
The voltage that is applied to the left front park/turn lamp is also applied to the left front marker lamp. If the headlamp switch is in the OFF position, the left front marker lamp will find a path to ground through one of the following lamps. The following lamps provide low resistance paths to ground:
• The right front marker lamp
• The right turn indicator
• The right front park/turn lamps
• The left front park/turn lamps
The left front marker lamp flashes with the turn lamps. The voltage drop across the marker lamp is much higher than the voltage drop across the other lamps. The lamps that are used for the ground path will not flash.
When the headlamp switch is in either the PARK or HEAD positions, voltage is applied through the following components:
• The EXT LP fuse
• The marker lamps
• The park lamps
When the left turn signal is turned on, the left marker lamp will have voltage at both connections. The left marker lamp does not light. When the turn/hazard flasher stops the voltage to the turn lamps, the marker lamp is grounded through the turn lamp. The marker lamp does not go on. The left front marker lamp flashes in the following manner:
• The left front marker lamp flashes on when the turn filament of the left front park/turn lamp goes off.
• The left front marker lamp flashes off when the turn filament of the left front park/turn lamp goes on.
Voltage is applied to the right lamps in the same manner, when the right turn signal is turned on.
Hazard Lamps
Voltage is applied at all times through the following components to the normally open contact of the hazard switch in the turn/hazard-headlamp switch assembly:
• The STOP HAZ fuse
• The turn/hazard flasher
When the hazard switch is turned on, voltage is applied to the following components:
• The front turn lamps
• The rear turn lamps
The following lamps flash on and off:
• All of the turn lamps
• Both of the turn indicators
The front marker lamps flash with the hazard lamps on, just as the front marker lamps flash when the turn lamps are on. If the headlamp switch is in the OFF position, the front marker lamps flash on when the hazard lamps are on. The front marker lights will flash on when the hazard lamps are on if the headlamp switch is in one of the following positions:
• PARK
• HEAD
When the hazard lamps are on, the following conditions apply:
• The turn circuit is always open.
• The turn/hazard flasher controls the lamp.
Park/Marker Lamps
Voltage is applied through the EXT LP fuse, to the headlamp switch at all times. Voltage is applied to the park lamps and the marker lamps when the headlamp switch is in the following positions:
• PARK
• HEAD
The front marker lamps are grounded through the turn filament of the respective front park/turn lamp. The front marker lamps light as a result.
Stop Lamps
Voltage is applied through the STOP HAZ fuse to the brake switch at all times. When the brake pedal is depressed, the brake switch closes. This action applies voltage through the turn/hazard-headlamp switch assembly to the following lamps:
• The high mounted stop lamp assembly
• The left tail/stop-turn lamps
• The right tail/stop-turn lamps

Clean Forward Looking Camera Clean windshield behind the camera cover Inspect Battery Battery & auxiliary battery if applicable, check and correct fluid level; check battery condition using "Midtronics MCR 717" tester. Brake Fluid Brakes and Traction Control Check thickness of front/rear brake pads. Check condition/thickness of front/rear brake discs. Inspect lines and hoses for signs of chafing, leakage or damage. Cooling System Engine cooling system, antifreeze and corrosion protection. Check lines and hoses for signs of chafing or damage. Drive Belt Check condition of poly-V-Belt Drive/Propeller Shaft Inspect condition of flexible disks. Fluids Leakage - Major components. (Underside of vehicle and engine compartment) Check for chafe marks, line routing, damaged components. Hood Check catch, safety catch and hinges on engine hood for proper operation. Lighting and Horns Horn, high beam flasher, hazard warning flashers, turn signals, warning/indicator lamps, illumination, interior/exterior lighting, front/rear lamps. Check trunk/rear cargo area lighting, if applicable Parking Brake System Check parking brake [function test only] Power Steering Fluid Seat Belt Systems Check seat belts and buckles for signs of external damage and proper function. Steering Inspect play of tie rod and drag link joints, inspect rubber boots. Suspension Check condition of front axle ball joints and rubber boots. Suspension Fluid (Active Body Control (ABC)) Tires Check TIREFIT tire sealant expiration date; if equipped Inspect tires for damage and splits, measure tread depth. Correct tire inflation pressure, including spare if equipped. Washer Fluid Wiper Blade Wiper and Washer Systems Windshield wipers/washer system. Headlamp cleaning system and rear window wiper/washer system if applicable. Inspect/Adjust Headlamp Check and correct headlamp setting. Replace Air Filter Element Every 52,000 miles or 4 years. Cabin Air Filter (Combination filter) Every 26,000 miles or 2 years. Engine Oil Oil Filter, Engine Reset Service Reminder Indicators

thanks

Pry the lamp assembly off with a flat screw driver, you must pry it off from right to left only. do not pry in front or back or on the left because you will damage the assy. This works for a MB c240 2005.