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Check that you have got the correct bulb for the one you replace . They both look the same but one has a single filiment for high beam only while the other will have 2 filiments for both high and low beam. If you are usin quartz halogen will be H1 the other will be H4
I don't know how to replace the headlight replacement, but I can tell you how to replace the bulbs if that is what you want to know. It all depends on if your vehicle is equipped with halogen or xenon bulbs. I am posting instructions for both.
1. Turn the headlamp bulb plastic cap counterclockwise to unlock and remove it 2. Turn the bulb socket counterclockwise to unlock and remove it (xenon) 3. Disconnect the electrical connectors from the bulb terminals (halogen) 4. Unlock the retaining springs and remove the bulb 5. Release the ignitor and remove from the plastic cap (xenon) 6. Turn the high beam lamp socket counterclockwise to unlock and remove it. Installation is the reverse order of removal.
NO YOU HAVE TO REPLACE HIGH BEAM LIGHT BULBS WITH HIGH BEAM LIGHT BULBS BECAUSE HIGH BEAM LIGHT BULBS AND LOW BEAM LIGHT BULBS TWO DIFFERENT TYPES OF BULBS.WEAR CLEAN LATEX GLOVES HANDLING THE HEADLIGHT BULBS WHICH IS HALOGEN LIGHT BULBS, OIL FROM FINGERS OR HAND WILL CAUSE HALOGEN BULBS TO OVER HEAT BLOW OUT.
you do not have greasy hands, but scoured and dry so nothing! But for
your BMW E66 can be diagnosed independently by L. and P. xenon to the errors,
settings xenon etc. Try to find error in diagnose!
If it's oem xenon than it should be 2 lamps. Because they had only xenon on the low beam (d2r type), however begin with changing the high beam. That one is inexpensive, so you could check if there are no other problems (like wiring).
Just open your hood and it should be clear how to open the cover for your high beam.
Sounds like the power ballast is failing - that's what takes the 12v signal from the car and amplifies it up to a level sufficient for driving the xenon bulb. Swap the ballasts between the headlights (they're easy to dismount) and see if the flicker goes to the other side (swap only the ballasts - leave the bulbs in their existing positions). If the flicker moves to the other side, the ballast is the problem. If it stays on the left side, the bulb needs replacement.
Search online for the bulbs - the dealer will kill you on pricing (the Audi dealership wants $200 each for my A4's xenon bulbs, but I can find them online for about $30 per pair (or less)). You'd want to order a D2S style bulb for an OEM BMW fitment, in 4300k color temperature.
Dip beam (outer) headlight
Open the bonnet.
Slide open the two spring clips (A) and remove the cover (B).
Press the spring clip inwards and push towards the bulb
to release the bulb and then remove the bulb from the light
unit. Pull the connector from the bulb.
Fit a new bulb to the connector, type H1 for dipped beam.
Fit the bulb to the light unit, the bulb will only correctly fit in
one position. Engage the spring clips to retain the bulb and then
fit the cover and retain using the two spring clips.
Close the bonnet.
Note: High Intensity Discharge (HID) Xenon light units,
type D2S 35W, are not renewable, contact your Dealer if the headligh fails to operate