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Home/DTC Codes/Lincoln/MKX/2014-2014 3.7L V6/P0404
P0404

EGR Control Circuit Range/Performance

2014-2014 Lincoln MKX 3.7L V6

Moderate SeverityPowertrainGeneric (SAE)

The 2014 Lincoln MKX is equipped with a 3.7L V6 engine. Below you'll find detailed p0404 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

Description

The EGR valve is not responding as commanded by the PCM.

Symptoms

  • Check Engine Light
  • Rough idle
  • Stalling
  • Poor performance

Common Causes

  • Carbon restricting EGR valve movement
  • Faulty position sensor in EGR
  • EGR valve mechanically stuck

Diagnostic Steps

  1. Command EGR open/closed with scan tool and monitor position
  2. Check for carbon restricting movement
  3. Test position sensor

Repair Notes

Clean or replace EGR valve.

Related Codes

P0403EGR Control CircuitP0405EGR Sensor A Circuit Low

Other Powertrain Codes

P0404 on Other Vehicles

Lincoln Aviator

2003-2003 4.6L V8 DOHC

Lincoln Aviator

2004-2004 4.6L V8 DOHC

Lincoln Aviator

2005-2005 4.6L V8 DOHC

Lincoln Aviator

2020-2020 3.0L Twin-Turbo V6

Lincoln Aviator

2020-2020 3.0L V6 Twin Turbo

Lincoln Aviator

2020-2020 3.0L V6 Twin Turbo Hybrid

Lincoln Aviator

2021-2021 3.0L Twin-Turbo V6

Lincoln Aviator

2021-2021 3.0L V6 Twin Turbo

Common Questions

What does code P0404 mean on a 2014-2014 Lincoln MKX?

P0404 stands for "EGR Control Circuit Range/Performance". The EGR valve is not responding as commanded by the PCM.

What are the symptoms of P0404 on a Lincoln MKX?

Common symptoms of P0404 include: Check Engine Light, Rough idle, Stalling, Poor performance.

What causes P0404 on a 2014-2014 Lincoln MKX?

Common causes of P0404 include: Carbon restricting EGR valve movement, Faulty position sensor in EGR, EGR valve mechanically stuck.

Last updated: March 2026

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