EZCarFix DIY Auto Repair

Dodge Challenger · Diagnostic Trouble Code

P0420 — Catalyst System Efficiency Below Threshold (Bank 1)

Quick overview of P0420 on your Dodge Challenger. Read the full diagnosis guide, then find the repair guides for your vehicle below.

Read the full P0420 diagnosis guide →

Repair guides that fix P0420

Dodge Challenger

2015-2023 Dodge Challenger — Replace Catalytic Converter

When the converter itself is the problem.

Dodge Challenger

2015-2023 Dodge Challenger — Check Engine Light / OBD2 Diagnosis

What that light means and what to check first.

General diagnostic information, not a factory service procedure. If you're unsure, have a qualified technician confirm the diagnosis before buying parts.