P0420 and catalyst efficiency codes: notes for public meetup-friendly jobs
FlexFix Team
# P0420 and catalyst efficiency codes: notes for public meetup-friendly jobs Warning lights are data, not destiny—interpretation matters more than the first code read. We document what we see, share **photos or notes**, and only move forward after you approve **scope and price**. Want a calm second opinion without losing your Saturday? **Book a mobile diagnostic** and we will map the next step. _Educational overview only—not a remote diagnosis of your vehicle. Estimates depend on inspection and your approval._