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2020 MAZDA MAZDA3
2.5L Skyactiv-G I4 (186 hp)•AWD•AUTOMATIC•gas
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor987Torque6478Fluid16DTC2264Battery2Maintenance0Recalls2
P1401moderate severityPowertrain

DPFE Sensor Circuit High Input

on 2020 Mazda Mazda3 2.5L Skyactiv-G I4 (186 hp) · AWD

What this code means

The DPFE sensor circuit is reading above the maximum expected voltage. The sensor is reporting excessive EGR flow or has an electrical fault producing a high reading.

Symptoms

  • Check Engine Light
  • Rough idle
  • Engine surge
  • Poor fuel economy
  • Knocking or pinging
  • Failed emissions test

Common causes

  • Faulty DPFE sensor corroded internally
  • DPFE sensor hoses reversed
  • Clogged EGR metering orifice
  • Wiring short to power
  • Vacuum leak in EGR system

Diagnostic steps

  1. Check DPFE sensor voltage at key-on engine-off (should be 0.45-0.55V; above 1V indicates bad sensor)
  2. Verify DPFE hoses are not reversed
  3. Inspect EGR metering orifice for blockage
  4. Check wiring for shorts to power
  5. Test sensor response to applied vacuum

Repair notes

Replace the DPFE sensor, which is the most common cause; verify hoses are correctly connected.

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