According to the Los Angeles Department of Transportation (LADOT), if a parking ticket fine remains unpaid after 90 days, the LADOT may refer the debt to a collection agency, and additional collection fees and penalties may be added. The collection agency will then have the authority to pursue the debt in accordance with applicable state laws and regulations, which may include filing a lawsuit or taking other legal actions to collect the outstanding debt.
It's important to note that while there may not be a specific statute of limitations for collecting a parking ticket fine in Los Angeles, it is recommended to pay parking tickets promptly to avoid any associated fees, penalties, and potential legal actions taken by the city or collection agencies.