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[Doctor Gollum]

Apparently needs an alternator.

However car starts runs and drives without too much issue... Battery light intermittent.

Couple of questions...

1. Does the alternator actually need to be coded to the car?
2. Yes or No to 1, can the regulator be replaced without too much drama and are they available?

Any alternative likely culprits?

[Mr Skrunts]

Does the alternator actually need to be coded to the car?

Why would an alternator need to be coded to a car?

I asked Google. Without the car details

No, a car's alternator typically does not need to be coded to the car, unlike a replacement battery which often requires registration to the car's computer system. Coding an alternator is not a standard procedure; however, some modern and European vehicles with complex charging systems may require programming the new alternator's unique id

With the car details.

Yes, a new or replacement alternator should be coded (programmed) to the car's Battery Management System (BMS) in a Jaguar XF 3.0. While the car may run without immediate damage, failing to code it is considered irresponsible by mechanics and can lead to issues with the charging system's efficiency and lifespan of components

[Kevin Wood]

Seem absolutely daft that it would need to be coded. Alternators don't have any unique characteristics that might need to be coded in.

Then again, modern cars are daft.