Hiya, Iv recently replaced my coil pack on my mk2 16v punto. The engine light started flickering as it did before I replaced the pack then stayed on continuosly. I have been wondering if the fault codes need to be reset. Also I fitted a new battery recently but I think it isnt powerful enough as the car still intermittewntly judders. The car is the speedgear box and I have a few other extra leccy gizmoes, does anyone think it might be in my best interest to up the battery? Thanks

Did the coil pack eliminate the original fault?

Yes best to read/clear errors.

A flickering engine light is a sign of possible catalytic damage.

strange that you mentioned the cat, I recently had the back box replaced and has been giving a little trouble, the new coil pack reduced the engine problem, it still judders a little when turning corners