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2010 MAZDA CX-7

2.5L I4•AWD•AUTOMATIC•gas
5 active safety recalls on this vehicle — view recalls
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Repairs0Labor547Torque3649Fluid9DTC889Battery1Maintenance0Recalls5
P1400moderate severityPowertrain

DPFE Sensor Circuit Low Input

on 2010 Mazda CX-7 2.5L I4 · AWD

What this code means

The Differential Pressure Feedback EGR sensor circuit is reading below the minimum expected voltage. The DPFE sensor measures exhaust gas flow through the EGR valve by detecting a pressure differential.

Symptoms

  • Check Engine Light
  • Rough idle
  • Stalling
  • Poor fuel economy
  • Failed emissions test

Common causes

  • Faulty DPFE sensor (most common)
  • Clogged DPFE sensor hoses
  • Wiring short to ground
  • Corroded DPFE sensor from moisture
  • EGR passage blockage

Diagnostic steps

  1. Check DPFE sensor voltage at key-on engine-off (should be 0.45-0.55V)
  2. Inspect DPFE sensor hoses for cracks or blockage
  3. Test DPFE sensor wiring for shorts
  4. Check for carbon buildup in EGR passages
  5. Replace DPFE sensor and retest

Repair notes

Replace the DPFE sensor, which commonly fails from moisture corrosion; inspect and clean EGR passages.

Other Powertrain codes on this vehicle

🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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