Headlight are dim

SOURCE: 2002 Grand Am GT Headlights seem dim , fog lights dont work

Check at the headlight sockets for a bad ground.

SOURCE: 2001 honda civic dim headlights will not come on just brightlight

Low beams are separate bulbs and could possibly both be burnt out

SOURCE: audi tt quattro turn light is not Blinking-stays on

Hazard lite switches go bad a lot in most audi and VW cars.  To remove you must first remove the radio.  Note you need special audi radio tools.  Next there is a cover above radio that clips in.  Remove this cover and you will be able to access the hazard light switch.  Install and test new switch before assembling.  This will take care of your issue.

SOURCE: location of fuel filter on a 2001 audi tt quattro

On a 2001 Audi TT Quattro the fuel filter is located forward of the fuel tank, in the right rear wheel well area. The fuel line clamps are a bit tricky. The change will improve performance. The owners manual does not even list changing the filter. But do it! use a Fram, and it fit perfectly. Good luck.

SOURCE: Audi TT Intermittent headlight

I'm having the same problem with my 2004 TT. I've narrowed the problem down to being the bulb. I swapped bulbs with the driver side and the problem followed the bulb. Your solution is to replace the bulb. You need a D2S 4300 K bulb. It's best to replace in pairs. Try here: http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=290310078483

You can change the bulb easily yourself in about five minutes, especially on the passenger side. You may want to disconnect the battery, though I don't know if that is necessary. You may also want to handle the bulbs wearing latex or nitrile gloves so as to not get your skin oil on the glass.

1. Remove the decorative cover that conceals the Coolant reservior. There is a single philips screw near the firewall that holds the cover down.

2. Find the back of the headlight and pull the metal wire clip that holds the back of the headlight cover toward the engine. Remove the cover.

3. Look inside and find the back of the HID bulb--it will be toward the outside fender. Twist the connector until it separates.

4. There is a retainer ring that holds the bulb in. Again, twist that until it comes loose. The bulb should come right out.

5, Put the new bulb in, noticing the notch is on top. Also, attach the retainer ring. It is marked "Top" to help orient it. Reattach the connector with a twist.

6. Make sure everything is firmly in place. Reconnect your battery and test the lights. Finish putting anything else back on.