Thanks for replying quickly.  We have checked the fuses, but they are OK.
Will have to find someone to look at the clockspring then.
Thanks.

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I have had my 2013 i30 from new. A few problems have started to creep in.
1) My horn doesn't work.

Start by checking the horn fuse(s)

2) L/100 will not reset with buttons on steering wheel.

Anything not working on the steering wheel panel tends to be blamed on the clockspring.

Wondering where and how I could get this fixed?

Youtube, autoelectrician, mechanic, dealer

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I don't think so. I'm sure I could get one, but I'm equally sure that I would have no idea what to do with it. 🙁

@MKE.  Thanks for answering my questions above.  So, No smoke!  Apparently modern synthetic oils and the CAT are stopping exhaust smoke.   I did not know that.

Also, thanks for the link about the Hyundai class action.  Interesting.  I'd guess that this matter may have been raised previously on this forum, but I can't remember it (not unusual these days .).

Please update the forum about the results of the various tests your mechanic carried out which, hopefully, identified the issue with your engine.

Cheers, TT

Nice intro