Car owners waste hours deciphering obscure diagnostic codes from tools like FORScan.
Build a mobile/web app with searchable code explanations, common fixes sorted by model/year, and community-contributed solutions.
Monetize through premium content subscriptions and affiliate links to recommended parts.
Start with crowd-sourced data for most common Ford Focus/Mazda3 codes before expanding.
Risk: Requires continuous updates as models change - community moderation helps.