One Dim Xenon Headlight.

[tonygilber]

New to this site, so thanks in advance for any help. I have a 2014 A3 with xenon headlights, one headlight is dim, I have changed the bulbs and both ballast units but its made no difference. The DRL's are working fine on both sides and the lenses look clean. Any advice to avoid large garage bills much appreciated.

[Steve Q]

I'd definitely recommend a diagnostic check now as you've done what you can. 

[tonygilber]

Thanks Steve, could I please ask if possible to expand on a diagnostic check ? Is this plug in a code reader or a auto electrician with a multimeter? The reason I ask is that there have not been any error codes displayed. Is this a main dealership visit or would any garage be able to help ? Thanks again for your time. 

[Steve Q]

11 minutes ago, tonygilber said:

Thanks Steve, could I please ask if possible to expand on a diagnostic check ? Is this plug in a code reader or a auto electrician with a multimeter? The reason I ask is that there have not been any error codes displayed. Is this a main dealership visit or would any garage be able to help ? Thanks again for your time. 

Yep I mean code reader. But if no idea displayed then I'd recommend an auto electrican to take a look.