Chevrolet Equinox · Diagnostic Trouble Code
P0420 — Catalyst System Efficiency Below Threshold (Bank 1)
Quick overview of P0420 on your Chevrolet Equinox. Read the full diagnosis guide, then find the repair guides for your vehicle below.
Repair guides that fix P0420
General diagnostic information, not a factory service procedure. If you're unsure, have a qualified technician confirm the diagnosis before buying parts.