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OBD2 Code

P0420

By the Fixopedia team · Updated June 2026 · 10 min read
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Fix cost (DIY)
Fix cost (shop)
Severity
Moderate
Drive with it?
Short-term
In this guide
  1. What it means
  2. Symptoms
  3. Common causes
  4. How to diagnose
  5. Fixes & cost
  6. FAQ

Repair guides that fix this

Emissions

Mazda Repair Guide

Repair guide