I believe that disconnecting the battery for a short while, then reconnecting it forces a rescan for car for faults. For this to be successful, you do need error free or original bulbs for it to work. This should clear any visual faults on the dash but may still have them logged in the cars unit. Don’t quote me on that just my logic lol!Never heard of that!^^ I never replaced mine, it just happened one day, with the originals. So after u reconnected the battery, u just went in and "turned" the lock steering wheel in both directions (fully) a few times, and that clears the codes?!
By disconnecting and reconnecting the battery all the lights come up on the dash which is cleared (visually) by turning the wheels on full lock. I found this out when the AA replaced my battery.