How to Replace a Mercedes Headlight


1. Pop the hood and examine the back of the headlight. Use a screwdriver to remove the mounting bolts of the headlight.
2. Disconnect the wiring harness from the back of headlight. The red (or black) cylinder sticking out from the back of the headlight is the ballast/bulb mount. Turn this counterclockwise to remove the back of the mounting structure.
3. Disconnect the four inner clips holding the bulb in place and slide the bulb out. Slide the bulb into the new headlight and reconnect the four inner clips.
4. Press the ballast onto the back of the bulb and turn it clockwise to lock it in place. Reconnect the wiring harness, then remount the headlight with the mounting screws (if applicable).
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How to Replace the Fuel Level Sending Unit in an Audi


1. Make sure the fuel tank is below half full. If it is not, drive the vehicle around until it is. Relieve pressure from the fuel lines before accessing the fuel level sending unit. Remove the fuel filler cap and the fuel pump relay from the engine bay fuse box. Crank the engine, and let the fuel lines empty; the engine will sputter and shut off. Disconnect the negative battery cable.
2. Open the trunk, and remove the carpet and the trunk liner. Locate the fuel pump access cover plate close to the rear seat. Remove the plate with the Phillips screwdriver.
3. Disconnect the wiring harness and fuel lines. Label the lines for input and output to properly reconnect them to the new fuel level sending unit.
4. Use Audi tool #3307 if the vehicle is an Audi A4. The Audi A4 fuel-level sending unit is attached to the fuel pump. Use the tool to remove the fuel pump to access the sending unit. Remove the fuel-level sending unit. For all other Audi vehicles, use Audi tool #3217 to remove the fuel-level sending unit plastic locking ring.
5. Install the new sending unit, and secure with the appropriate Audi tool. Replace the fuel pump for A4 vehicles. Reattach the fuel lines for input and output. Connect the wiring harness and replace the fuel pump access cover.
6. Replace the trunk liner trim and the carpet. Attach the fuel filler cap, the fuel pump relay and the negative battery terminal. Start the engine, and check underneath for fuel leaks.
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How to Unlock an Audi Concert


1. Press 'FM2' and 'RDS' at the same time and hold them down until '1000' appears on the display. Do not press these buttons again until you are finished unlocking the Concert unit.
2. Press the '1' button the number of times equal to the value of the first digit in the radio code. For example, if the code is 9876, press the '1' button nine times. The number 9 will appear on the display. If you don't have the code, contact your Audi dealer or go to the Radio Code website (see Resources) to get it.
3. Repeat Step 2 with the '2,' '3' and '4' buttons until all four digits of the code appear on the display.
4. Press 'FM2' and 'RDS' at the same time and hold them down until 'SAFE' appears on the display. The Audi Concert should unlock after a few seconds.
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How to Install a Boost Gauge on an Audi


1. Choose which vent you are going to install the gauge in and remove it by pulling it out. Inspect the vent to see if the gauge will fit into it. You may have to trim the rear flap of the vent to allow the gauge to sit in it.
2. Hold the boost gauge against the vent and draw a circle with a pen or white pencil around it to mark where the cut is going to go.
3. Use a dremel with a small cutting wheel and carefully trim the hole that you have traced. Test fit the gauge to make sure it fits in the trimmed hole very snugly. Smooth any rough edges with sandpaper.
4. Drill a small hole in the ducting that leads to the vent to allow the pressure tube for the gauge to go through. Run the tube through it. This should be included with the gauge.
5. Remove the trim located below the steering wheel and remove it. There are probably three or four 8-mm nuts.
6. Open the hood. At the rear of the engine on the left side of the brake fluid reservoir are two rubber seals. Remove them both, exposing two holes.
7. From under the steering column, route the gauge tube through the holes. Make small holes in the rubber seals for the tube. Run the tube through the seals and then reinstall the seals.
8. Connect the gauge to the intake manifold by cutting the hose that goes to the fuel pressure regulator and installing a 'T' adapter for the gauge hose.
9. Hook up the power wire for the gauge to an existing wiring harness that goes to the factory gauges. Ground the black wire that is on the gauge to a suitable ground in the dash. Reinstall the vent and gauge and test it to make sure it works.
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How to Install a Wastegate on a Turbo


1. Drive the car somewhere out of the way, or tow it if the wastegate is broken. Driving a turbocharged car with a damaged wastegate can seriously damage the turbocharger and the engine. Place the car in park and turn off the car. Pull the hood release latch and then prop the hood up with the prop stick. Disconnect the black wire from the car battery to ensure that the car's circuits are dead.
2. Locate the wastegate valve on the turbine side of the turbocharger. The wastegate is a small metal valve bolted onto the turbocharger's exhaust feeder pipes. Disconnect the control wire from the wastegate and place it to the side. Use a wrench to unbolt the two bolts that secure the old wastegate to the turbocharger. Pull the wastegate out, being careful not to scrape the sides of the hole.
3. Slide the new wastegate into the hole on the exhaust feeder pipe. Slide in the bolts and screw them down by hand. Once both bolts are down, wrench them down flush with a wrench. Plug in the control wire into the side of the wastegate. Make sure there is no packing material stuck in the valve. Reconnect the black wire on the car battery and then shut the hood. Turn on the car and take it for a test drive.
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How to Remove the Coil Pack in a VW


1. Pop the hood and locate the coil pack on the driver's side of the engine. This is a small black box with all of the spark plug wires leading into it.
2. Label each spark plug wire using the permanent marker and the masking tape. To do this, pair up each plug wire with each post on the coil pack, and label each pair with the same number. For example, the plug wire plugged into the top right post would be labeled "1," and the post would have a "1" label on it as well. It's not important which cylinder these plug wires actually control, just their location on the coil pack for re-installation. Repeat this process for every plug wire on the coil pack.
3. Pull off all of the spark plug wires using your hands by gripping at the base of the spark plug wire and tugging backward. Unclip the wiring harness leading into the coil pack by pushing on the tab in the middle using your thumb. Then use the 3/8-inch ratchet, extension and sockets to unbolt the coil pack from the motor.
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How to Reset B Service on a 2007 Mercedes Benz C350


1. Insert the key and switch the ignition to position 'I'.
2. Press the display button on the multifunction steering wheel until the 'B Service' notification is displayed.
3. Press and hold the reset button located to the left of the instrument cluster until the 'B Service' message resets.
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How Do I Fold Down the Rear Seats on a 2003 CLK 320?


1. Start the CLK 320's engine. Press the back headrest button located on the center dashboard console. Fold the rear headrests back by pressing the release button located on the sides of the headrests while pushing forward on the cushions.
2. Open the trunk. Locate the red release handle for the rear backrest. Turn the release handle counterclockwise.
3. Pull the release handles located on the exterior sides of the bottom seat cushions. Fold the bottom seat cushion forward.
4. Grasp the top of the rear seat's backrest. Fold it forward to complete the process.
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How Can I Reset the Tire Pressure Monitor in an Audi?


1. Insert the key into the ignition. Turn the ignition switch to the 'On' position without starting the engine.
2. Press the 'Car' button on the control panel on the information display.
3. Press the down arrow to scroll through the options until 'Tire Pressure Monitor' is highlighted.
4. Press the 'Option' button. The reset confirmation is displayed.
5. Press the 'Option' button again to confirm and reset the system.
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How to Reset the Date amp; Time in an Audi TT


1. Pull outward on the silver (or black) "Stalk" that is to the immediate right of the clock. There are two such stalks. Between the two of them, you want to pull the "Left stalk" — which will be just to the right of the clock. Pull the "Stalk" outward toward yourself. The hours will then blink, if you pulled it out far enough.
2. Pull the "Stalk" out repeatedly to cycle to the field you want to change; this includes hours, minutes, month, day, and year.
3. Change the field that is blinking by rotating the "Stalk" clockwise. Set the correct time and date.
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