Question about 2003 Ford Expedition

1 Answer

2003 ford expedition check engine light is on. It is reading a p405 code which is the egr sensor. I have change the sensor and the pig or electrical code twice . I brought the sensor from ford.

P405 error code egr sensor/

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Ford Master
  • 15,575 Answers

This DTC says nothing about changing the sensor or the connector or pig tail ! It's a circuit voltage low code
P0405 - DPF EGR Sensor Circuit Low Voltage Detected See DTC P1400 Problem with wiring or PCM !
P1400 - DPF EGR Sensor Circuit Low Voltage Detected The EGR monitor checks the DPF EGR sensor signal to the PCM for low voltage. The test fails when the average voltage to the PCM drops to a voltage less than the minimum calibrated value.

  • DPFEGR circuit short to GND
  • Damaged DPF EGR sensor
  • VREF short to GND
  • Damaged PCM
A DPF EGR PID reading less than 0.2 volt with the key ON and engine OFF or running, indicates a hard fault.

Posted on Sep 01, 2016


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have a 1998 ford escort with a check engine light on and can't get it off

Here is a list of possible causes. Some things you have already done.

EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- EGR volume control valve stuck closed
- Faulty EGR Pressure sensor
- Faulty EGR temperature sensor and circuit
- Faulty EGR Valve
- EGR passage clogged
- Exhaust gas leaks
Read more:

Oct 07, 2012 | 1998 Ford Escort

1 Answer

My 2000 Ford Expedition XLT's check engine light

I'm probably not going to be able to give you a proper diagnosis without knowing which codes are setting the check engine light. There are about 300 problems that can set the light. Most common thing for your vehicle with not running bad is what they call the DPFE (differential pressure feedback) sensor. It's basically a vacuum/pressure monitor for the EGR system and they get stopped up or corrode as they have exhaust gases running through them and are made from aluminum or plastic. If you post code numbers (go to advance or autozone and they will read them for free) and I can give you a better idea of what the problem is.

Jun 19, 2011 | 2000 Ford Expedition

1 Answer

1997 ford expedition 5.4 reading lean on code scan i changed egr valve and egr pressure valve

Check this thoroughly for vacuum leaks. Ford uses 90 degree elbows that collapse and create major vacuum leaks. This is usually the reason for lean codes and mass air flow sensor codes.

Feb 13, 2011 | 1997 Ford Expedition

1 Answer

2003 Ford Expd. running rough @ idle -

There could be many issues. These codes read your engine is running too lean. Check : all your vacuum hoses for leaks, PCV valve and hose, MAF sensor. This may require an experienced technician to figure this out. Hopefully I help'd!!

Apr 05, 2010 | 2003 Ford Expedition

1 Answer

It surges at idle. Seems like it will turn off if I don't hold the brake and give it some gas. ????? at speed it seems ok but the Check Engine light is on. 4.6L 2003 Ford Expedition

Go to Autozone or Oreillys for a free scan. The "check light" may have diagnosed the problem. Usually it is a TPS -throttle position sensor or some part in the EGR circuit. If it does diagnose "EGR" flow problems you should clean under the airhorn to remove the soot buildup.

Remember to disconnect the battery cable for 10 minutes to clear the trouble codes after working on the truck.

Nov 29, 2009 | 2003 Ford Expedition

1 Answer

I changed EGR valves, selinoid, sensors, and even

go to auto zone or someone with a scan tool to find out what codes are stored on the computer in the car

Jul 30, 2009 | 1997 Ford Expedition

1 Answer

01 Ford Expedition. Check Engine light and failed Smog check.

whoever installed the egr valve, if it wasnt you, just cleared the engine codes, thus giving you this problem once again. Get it scanned at autozone, and go from there.

May 18, 2009 | 2001 Ford Expedition

3 Answers

My expedition check light engine on code#po306

stop in at autozone and have them read the codes .. it's free then repost the question with those codes


please take a moment to rate this solution thanks

Jan 30, 2009 | 1996 Ford Explorer

Not finding what you are looking for?
2003 Ford Expedition Logo

Related Topics:

60 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

85223 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

gerry bissi

Level 3 Expert

4388 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides