P1409 - FAULT CODE - OBD2

POST UPDATED IN January, 2023

P1409 Code failures by brands

P1409 FORD, JAGUAR, LINCOLN, MAZDA, MERCURY: EGR VACUUM REGULATOR SOLENOID CIRCUIT MALFUNCTION

Description of DTC code P1409

The Exhaust Gas Recirculation (EGR) is a system is that limits nitrogen oxide emissions. To achieve this goal, the nitrogen oxide is sent to the upper engine inlet, where it is mixed with the resulting air-fuel charge. This process burns cooler and significantly reduces temperature, which reduces the amount of nitrogen oxide emissions.

The EGR vacuum regulator solenoid controls or regulates how much vacuum is provided to the EGR valve, allowing it to open or close as required by the engine conditions. This system continuously makes several self-checks to verify that each component is not working wrongly.

The P1409 OBDII fault code is a code that Ford, Jaguar, Lincoln, Mazda, and Mercury vehicle manufacturers use to indicate that after the electrical function test of the EGR vacuum regulator solenoid (EGRVR), voltage is out of the allowed range in their circuits, which is considered a malfunction of the circuit. To complete the test, the Exhaust Gas Recirculation system must be enabled.

Symptoms of fault code P1409

  • Check Engine ON.
  • Limited engine power.
  • Lower fuel efficiency.
  • Irregular operation during idling.

Causes of OBD2 P1409

Reasons to set the P1409 OBD2 diagnostic code:

  • The EGR vacuum regulator solenoid may have damage to its electrical connector.
  • The solenoid circuit may be shorted or open due to wiring deficiencies.
  • Possibly the EGRVR is faulty.
  • There may be damage to the PCM.

Possible solutions of the DTC code P1409

The steps to follow to correct the DTC P1409 OBDII code are:

  • First, consult the Technical Service Bulletins.
  • Inspect the electrical components of the EGR vacuum regulator solenoid and check that all components are in good condition. If you detect corrosion or burn damage, make repairs or replacements.
  • Measure the EGRVR circuit voltages to verify that the EGRVR circuit is not shorted. If you discover inconsistencies in the voltages, make the appropriate corrections.
  • Take a reading of the resistance of the EGR vacuum regulator solenoid and compare the result to the manufacturer's specification. Generally, a resistance of 26-40 ohms at 68ºF is required. An out-of-range resistance requires the replacement of the solenoid.

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