What does code P1406 mean on Mazda vehicles?
The downstream DPFE sensor hose is disconnected or blocked, affecting EGR operation.
OBD-II Code Mazda
P1406 — Mazda — DPFE Sensor Downstream Hose Off or Plugged
The downstream DPFE sensor hose is disconnected or blocked, affecting EGR operation.
Common symptoms
- EGR system malfunction
Possible causes
- Damaged or blocked DPFE hose
Initial recommendation
Inspect and reconnect or replace downstream DPFE hose.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine Mazda code P1406 with your vehicle's actual symptoms for more complete diagnostic guidance.
Go to the app View more brands