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Author Topic: What does each ballast do and do they need coding?  (Read 45 times)

Offline flipflops

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What does each ballast do and do they need coding?
« on: 11 February 2026, 20:31 »
Hi, faulty headlight on a mk7 GTI, it was flickering for a while and now dead.

What doe each of the ballasts do please?

Replaced the rear ballast but it's not resolved it.

Do I need to either code the rear one in for it to work, or should it not need coding so replace the front?

If I replace the front one will that need coding?

If it needs coding, will an OBD11 be ok?

Thanks in advance for any replies, MOT in a week so need to sort :)

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Offline Watts

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Re: What does each ballast do and do they need coding?
« Reply #1 on: 11 February 2026, 20:48 »
Was it not just the bulb then?
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2015 Tornado Red 3dr GTI PP, manual, Santiagos, Audi short shifter.

Offline flipflops

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Re: What does each ballast do and do they need coding?
« Reply #2 on: 11 February 2026, 20:51 »
Unfortunately not, swapped both bulbs and no change
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