Amend P46(Car) Submission

The wrong date on a P46(Car) submission for an employees first car was submitted, it was put as the 3rd May but should have been 3rd June. Since this they have received a new car on the 1st August which has been submitted correctly that replaced the first car however I am unable to amend the submission for the first car. Is there a way to do this online or would we need to contact HMRC directly to get this resolved?

Hi ,
 

I beleive the individual can contact personal tax to advise them and they may be able to correct the tax code. They can be reached on 0300 200 3300  . Thank you .