Mazda Diagnostic Trouble Codes

Common OBD2 fault codes found on Mazda vehicles with model-specific causes, known issues, TSBs, and adjusted repair cost estimates. Each guide is tailored for Mazda owners.

Fuel System

P0171Moderate

System Too Lean (Bank 1)

Mazda CX-5 • 2012-2024

On Mazda engines, P0171 shows up on both the older 2.0/2.3 MZR (Mazda3, Mazda6) and the Skyactiv-G. ...

Emissions

P0420Moderate

Catalyst System Efficiency Below Threshold (Bank 1)

Mazda 3 • 2004-2024

On Mazda Skyactiv-G petrol engines (Mazda3, Mazda6, CX-5 with the 2.0 and 2.5), P0420 is most often ...

Diagnose your Mazda with Skanyx

Connect a standard Bluetooth OBD2 adapter to your Mazda, scan for codes, and get AI-powered diagnostics with severity ratings and repair cost estimates.

Download Skanyx