How to Change an Onboard Computer to English in a BMW E36

1. Insert the key in the ignition and turn it forward two clicks to turn on the car's electrical equipment.
2. Locate the onboard computer in the bottom center of the dashboard. It has one large display screen, one small display screen and 18 keys.
3. Press and hold the key marked '1000' and the key marked '10' simultaneously until the phrase TEST-NR appears in the large display screen.
4. Press the key marked '10' once and the key marked '1' nine times until the numeral 19 appears on the large display screen.
5. Press the key marked 'SET/RES' once until the phrase 'LOCK: ON' appears on the large display screen. You must now calculate and enter a date-specific unlocking code.
6. Calculate the unlocking code by adding the numerical number of the current month, plus the day of the month. For example, if you are entering the code on June 4, the code to enter is 10.
7. Enter the date-specific unlocking code you have calculated by pressing the keys marked '10' and '1' until the proper number appears on the large display screen. Press the 'SET/RES' key once. The onboard computer is now unlocked and the large display screen should again display the phrase 'TEST-NR.'
8. Press the key marked '10' once and then press the 'SET/RES' key once.
9. Press the key marked '1' until the large display screen reads 'LAND: 2 USA' and then press the 'SET/RES' key once. The display will now be changed to English. Press the key marked 'CHECK' once to exit the system.

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How to Change an A4 Headlight

1. Turn off the A4's engine and engage the parking brake.
2. Raise the hood of the A4 and remove the plastic cover over the power steering reservoir, if replacing the headlight on the driver's side. If replacing the passenger's side headlight, remove the air intake tube that runs from the grill to the intake box by removing the two screws holding the intake tube in place. Remove the engine compartment trim panel for models manufactured after 2007.
3. Remove the four screws holding the headlight assembly in place--you will find two located at the front of the headlight and two at the back. This will loosen the headlight assembly.
4. Unplug the harness and pop off the wire loom attached to the assembly. Lift the assembly out of the vehicle.
5. Unclip the back cover on the headlight assembly and pull out the old H7 bulb. Use a clean cloth to install the new H7 bulb. Do not touch the glass portion of the bulb and do not use anything other than an H7 bulb.
6. Place the assembly back into the engine compartment of the A4 and reattach wiring harness and wire loom. Reinstall the four screws and place the power steering reservoir over (or place the air intake tube back into the vehicle). Close the hood.

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How to Remove an Audi TT CD Changer

1. Put both European release keys into the slots, at both sides of the CD stereo. Each key is designed with two ends that fit into two slots. There are four slots on the stereo, two slots for each key.
2. Pull out both European release keys towards you to unlock the CD stereo and pull out the CD stereo from the Audi's center console.
3. Pull the aerial and ISO wiring out from the back of the Audi's CD stereo.

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How to Remove the Water Pump on a Mercedes 300CE

1. Park your Mercedes on a flat area and let the engine cool for at least an hour before working on the vehicle. Open the hood and locate the serpentine belt routing diagram on the locking latch atop the radiator and fan. Use this diagram to find the serpentine belt tensioner pulley that needs to be released to remove the serpentine belt attached to the water pump.
2. Slot a socket plus the ratchet over the end of the bolt sticking out of the tensioner pulley. Rotate the bolt counterclockwise to loosen tension on the belt. Slide the belt off the tensioner pulley and allow it to return to its original position. Remove the belt from the water pump.
3. Place the drain pan under the plug on the bottom side of the radiator. Take the cap off the radiator as well as the overflow reservoir. Open the drain plug to drain the coolant out of the radiator. Replace the plug once it has finished draining.
4. Remove the hose from the top of the water pump. Loosen the hose clamp with a screwdriver. Detach the battery cables with a wrench. Remove the fan blade with a wrench or socket and detach the mounting brackets for the water pump in the same fashion. Remove the water pump from the engine block. Pry it loose with a screwdriver if it is stuck on.
5. Clean the engine block of debris from the old gasket. Mount the new gasket on the face of the new water pump. Set the pump against the engine block in the same place as the old one and mount it with the corresponding bolts. Reattach the fan blade and the radiator hose. Reconnect the battery cables. Slide the serpentine belt back over the water pump pulley and release the tension on the tensioner pulley to slide the belt back over the adjustor. Release the tension on the pulley and let the belt tighten. Remove your tools and close the hood of your 300CE.

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How to Tune a BMW Series 5

Performance Air Intake
1. Unhook the air filter casing from the engine, located on the driver side of the vehicle. A performance intake upgrade will free up horsepower and improve fuel efficiency, and the new air filter can be removed and cleaned periodically for reuse.
2. Lift the old filter out of the casing slowly, making sure dirt and debris does not spill onto the engine bay.
3. Remove any dirt or debris that fell into the intake system carefully.
4. Install the new, aftermarket air filter just as the old one was positioned. Fasten the hardware back into place as necessary.
5. Leave air filter casing off of vehicle to expose filter to more air, ultimately leading to maximum power gain. Regularly monitor the air filter and clean annually.
Oil and Oil Filter
6. Jack each front wheel off of the ground to gain access to the oil pan and filter. Once each side has been lifted, place a jack stand behind the wheel and lower the vehicle down until it rests firmly on the stand. Change engine oil once every 3,000 miles to optimize engine performance.
7. Put the oil recyling container under the oil pan and remove the plug. Let all of the oil drain from the pan and replace the plug when finished.
8. Turn the oil filter counter-clockwise with an adjustable wrench to remove.
9. Add motor oil to the new filter until it is 2/3 full. Use your hand and turn the filter clockwise into position until completely tight.
10. Pour new motor oil into the engine's oil compartment with the provided funnel. Check the dipstick to measure the levels of the oil, simply adding more if needed.
Distributor Cap and Rotor
11. Remove the black cap that protects the distributor of the BMW 5-Series. Both of these are located at the front of the engine, and not hard to locate. Unbolt the distributor from its location and set aside.
12. Unscrew the bolts holding the rotor in place. Pull off this shield and inspect the O-ring inside. Replace if necessary.
13. Tug on the spark plug wires from the boot with the provided wire pullers. Connect each wire lead to the corresponding position on the new distributor. Position new distributor into place and put dust shield back on top.
14. Bolt new rotor into place using the old hardware. Fasten the distributor cap back into place using the provided hardware.
15. Jack each side of the vehicle off of the jack stands and lower the car.

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How to Reset the Service Message on an E320

1. Turn the ignition switch to 'On' without starting the engine.
2. Press and release the '0' button on the left side of the instrument cluster twice immediately after turning the ignition on.
3. Turn the ignition off.
4. Press and hold the '0' button.
5. Turn the ignition on.
6. Release the '0' button after the service message resets. Turn the ignition off.

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How to Replace a Battery in a Mercedes ML430

1. Pop the hood. Locate the battery at the rear of the engine bay. Push down the black tab on the top of the battery with your thumb, then pull it out of the strap. Press down on the metal strap to unhook it at the base of the battery tray.
2. Pull off the rubber strip around the perimeter of the battery. Unbolt the guard at the base of the positive terminal using a 3/8-inch ratchet and socket.
3. Locate the battery surround, which is the steel tray running around the perimeter of the battery. Push down on the battery surround using your hands, then lift it up and out of the engine compartment. Unbolt the battery terminals from the battery using an open-end wrench. Lift the battery out.
4. Set the replacement battery in the engine compartment. Reconnect the battery terminals with an open-end wrench, starting with the positive terminal, then finishing with the negative. Push the battery tray back into the engine compartment. Slide the black tab that you removed in Step 1 back under the battery tie down. Push the rubber molding back onto the tray.
5. Push the metal strap that goes over the battery down to hook it into the chassis. Slide the black rubber stopper back under the strap so it looks like it did in Step 1.

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How to Change Flat BMW Tires

1. Place the lug nut wrench on each lug nut one at a time. Apply counterclockwise, downward force with your foot to loosen each lug nut. BMW wheels generally each have five lug nuts. Loosen the lug nuts before jacking the car up so that the wheel does not spin while suspended in the air.
2. Place the jack under the chassis of the BMW closest to the tire that needs to be replaced. The jack should be placed on a hard, even surface so that it holds the car up sturdy enough for the tire to be replaced.
3. Jack the car up so that it is suspended 6 to 8 inches off the ground.
4. Remove the lug nuts and place them on the side to be used later on once the new tire is in place.
5. Remove the new tire from the trunk or underneath the vehicle as stated in the BMW owner's manual for that model. Place the flat tire in the trunk.
6. Place the new tire on the BMW and screw in the lug nuts by hand so that they hold the wheel in place while the car is jacked down. Jack the car down and place the jack back in the designated area of the vehicle.
7. Tighten the lug nuts using the lug nut wrench. Place the wrench back in the designated area of the vehicle. Drive to the nearest service station to have the flat tire repaired.

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How to Upgrade the Performance of an Audi RS4

1. Perform a full vehicle tune-up (including changing all critical fluids, such as oil, coolant, transmission fluid and replacing the spark plugs/ wires). Before modifying the RS4 for additional power, make sure it is in peak running condition; tuning the engine to increase output will undoubtedly place more stress on several components, causing faulty or worn out parts to fail.
2. Install a high-flow intake. This can range from a sinple drop-in air filter upgrade, to an entire cold air system, which replaces the factory induction piping. This allows the engine to breathe better for faster turbo spool up, and more power and torque at high engine speeds.
3. Add an aftermarket exhaust. The factory exhaust system, although quite capable, is designed to meet stringent noise and emissions levels, installing larger diameter exhaust piping will reduce back pressure and liberate more ponies throughout the RPM band.
4. Install a custom ECU. Now that the critical intake and exhaust systems are upgraded, its time to maximize performance. The ECU can be reprogrammed or replaced to provide custom fuel and timing maps. This not only dramatically increases horsepower, but also ensure a smooth running vehicle with proper idle and engine speed limits.
5. Tune your RS4 on a 4 wheel drive Dyno. In addition to measuring vehicle horsepower over the entire power-band, it provides a safe environment to adjust various settings such as fuel pressure, boost levels and will further tweak power delivery on both pump gas and racing fuel (if desired).

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How to Install a Thermostat on a BMW 323ic

1. Remove the radiator hose from the thermostat housing by loosening the retaining clip that secures the hose onto the housing with the screwdriver. Pull the hose off the thermostat housing and hold it vertical so the antifreeze goes back into the radiator. Push the hose off to the side to make accessing the thermostat housing easier.
2. Remove the 10 mm bolts that hold the thermostat housing onto the intake manifold of the BMW with the wrench and then pull the thermostat housing off the intake manifold.
3. Remove the old thermostat and then place the new one into the intake manifold. The thermostat sits on a machined lip that is located below the level of antifreeze. The thermostat should be properly seated to ensure it works correctly.
4. Pull the old thermostat gasket off the intake manifold and place a bead of RTV gasket sealer in its place on the intake manifold. Place the paper thermostat gasket on top of the RTV gasket sealer. Place a small amount of RTV gasket sealer on the bottom of the thermostat housing and then bolt the housing back into place.
5. Place the radiator hose back onto the thermostat housing and secure the retaining clip into place.
6. Start the engine and allow it to warm up. Inspect for leaks where the thermostat housing is bolted to the intake manifold and where the radiator hose connects to the housing. If the radiator hose leaks, replace the retaining clip with a band clamp. If the area where the housing and the manifold bolts together leaks, tighten the housing bolts more.

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