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P1406 – Mazda DTC

Mazda DTC P1406 – DPFE Sensor Downstream Hose Off or Plugged

DTC P1406 meaning on Mazda

DTC P1406 on a Mazda indicates an issue with the DPFE (Differential Pressure Feedback EGR) sensor downstream hose being either disconnected or obstructed.

Mazda DTC P1406 symptoms

Symptoms of DTC P1406 on a Mazda may include:

  • Check Engine Light (MIL) illuminated
  • Decreased engine performance
  • Increased fuel consumption
  • Rough idling or stalling

Mazda DTC P1406 causes

Common causes of DTC P1406 on a Mazda include:

  • Disconnected or damaged DPFE sensor downstream hose
  • Obstruction in the DPFE sensor downstream hose
  • DPFE sensor failure

Mazda DTC P1406 seriousness

While DTC P1406 may not cause immediate harm to the vehicle, it can lead to decreased fuel efficiency and engine performance if left unresolved.

How to diagnose DTC P1406 on Mazda

To diagnose DTC P1406 on a Mazda, follow these steps:

  1. Use an OBD-II scanner to retrieve the trouble codes.
  2. Inspect the DPFE sensor downstream hose for any signs of damage or disconnection.
  3. Check for obstructions in the hose.
  4. Test the DPFE sensor for proper functionality.

How to fix DTC P1406 on Mazda

To fix DTC P1406 on a Mazda, you can:

  1. Reconnect or replace the DPFE sensor downstream hose if disconnected or damaged.
  2. Clean out any obstructions in the hose.
  3. Replace the DPFE sensor if it is faulty.

How to erase DTC P1406 on Mazda

To erase DTC P1406 on a Mazda:

  1. Fix the underlying issue causing the DTC.
  2. Use an OBD-II scanner to clear the trouble codes.
  3. Drive the vehicle to allow the system to retest and verify the repair.

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