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OBD-II Code Mazda

P1400 — Mazda — DPFE Sensor Circuit Low Input

The differential pressure feedback EGR (DPFE) sensor voltage is lower than expected.

Brand Mazda
System Emissions
Severity Medium
Safe to drive? Yes, with caution
Advanced scanner Not necessarily

What does code P1400 mean on Mazda vehicles?

The differential pressure feedback EGR (DPFE) sensor voltage is lower than expected.

Common symptoms

  • Check engine light

Possible causes

  • Faulty DPFE sensor
  • wiring issue

Initial recommendation

Test DPFE sensor output and inspect wiring.

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.

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