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Mazda 6 (2004) - headlights - fleggo

When my headlights are on there is a loud buzzing noise coming from them. i believe it has to do with the adjustment to the beam level which is operated from the cabin manually. Currently i have lodged the the switch between 0 and 1 and the noise has ceased and the lights are fine. Can someone tell me how to put it right? I have never used this function but fear it could be the cause of Mot test failure or ControlTechnique as it it is called here in France.

Mazda 6 (2004) - headlights - wmo

The electronic headlamp hight adjuster is faulty. I had the same problem with both of my headlamps on my 2003 Mazda 6. Both were replaced under warranty.

Mazda 6 (2004) - headlights - fleggo

Thank you wmo for your reply. i was afraid that would be the case. My car is well out of warranty of course so i guess i can expect a large bill.