How to Reset a BMW E46

1. Attach the tool to the data link connector, located under the BMWs dashboard.
2. Switch on the BMWs ignition.
3. Watch for the screen on the tool to illuminate and select BMW using the scroll buttons on the tool and then push the reset tools OK button.
4. Select the E46 model with the scroll buttons and push the OK button.
5. Select Reset of Service Warning Light with the scroll buttons and push the OK button.
6. Anticipate for screen to read Reset Ok!
7. Switch off the BMW E46s ignition and remove the tool from the vehicle.

How to Reset the Radio Lock on a 2001 Audi TT

Retreive and Enter 4-Digit Code
1. Locate your TTs owners manual and look for the radio, audio or stereo subsection. On the inside flap, where your radios model and serial number are printed, locate the four-digit code specific to your radio.
2. Insert the key into the ignition and turn it to the on position. There is no need to start the car. Turn on the radio and wait for the SAFE warning to appear on the deck.
3. Depress the P.SCAN and RBDS buttons simultaneously and continue to hold them down until 1000 appears on the screen. Immediately release both buttons.
4. Depress the radios buttons 1 through 4 repeatedly until the code on the radio deck matches your cars specific code. The buttons correspond to a singe digit in the code. For example: The code 3-2-8-5 will require you to press the 1 button three times, the 2 button two times, the 3 button eight times and the 4 button five times.
5. Depress the P.SCAN and RBDS buttons simultaneously again, and hold them down until the deck re-displays SAFE. Release both buttons. The radio should operate normally.

How to Reset the E90 Cabin Air Filter Warning

1. Replace the cabin air filter if you have not done so already. Open the hood and examine the passenger side of the engine bay near the firewall to find the cabin air filter housing. The filter extends from one end of the engine bay to the other.
2. Remove the six 8mm bolts from around the cabin air filter housing. Lift the cover off to expose the filter.
3. Remove the old filter and discard it. Insert the new filter, replace the cover and tighten the bolts.
4. Insert your smart key into the electronic ignition. Press the Engine Start/Stop button without placing your foot on the brake (or on the clutch, if its a manual transmission). Wait for the service warning light to disappear.
5. Press and hold the trip odometer reset button (on instrument panel). Wait for the oil can icon to appear (it will appear after the service triangle) to indicate you are at the service menu.
6. Toggle the indicator stalk until you reach Cabin Filter. Press and hold the BC button at the end of the stalk to reset the interval and turn off the warning display.