EGR P0401, P0403 and P0405

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Sep 2, 2018 | 11:26 AM

chewyshaun

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Joined: Aug 2018

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From: Paulton, England

EGR P0401, P0403 and P0405

New jag x type to me which is a 2006 2.2d, I had the engine light come in with a P0401 code, I erased the code but comes back on every 100 miles or so. I bought a replacement egr valve and when I went to fit it I found that mine was blanked off with a 6mm hole drilled in. The egr is the electronic version. I went ahead and put the new EGR valve in and removed the blanking plate which resulted in a P0403 and a P0405 code. I have now put the blank back in as I don’t want to risk going into limp home mode. Any ideas on how I fix this or do I leave the blank in and keep resetting the code.

Sep 2, 2018 | 02:42 PM

Dell Gailey

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Joined: Mar 2017

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From: Utah

See post 4 about the "hole"

https://www.jaguarforums.com/forum/d...g-worth-54774/

code p 0403 refers to EGR --circuit malfunction===causes --wiring---EGR solenoid --ECM
replacing the valve probably not the problem as there is a separate solenoid to work the valve and that is what is listed in the probable causes
then you have to consider the wiring and connections to the unit.

Jaguar X-Type P0403 Engine Trouble Code - Jaguar X-Type P0403 OBD-II Diagnostic Powertrain (P) Trouble Code For Jaguar X-Type | EngineTroubleCode.com

https://www.jaguarforum.com/showthread.php?t=37805

P0402

Description of the defect

EGR Flow Excessive Detected
The EGR system is monitored for undesired EGR flow during idle. The EGR monitor looks at the DPF EGR signal at idle and compares it to the stored signal measured during key ON and engine OFF. The test fails when the signal at idle is greater than at key ON engine OFF by a calibrated amount.

Possible causes

List of elements that might trigger the appearance of this code

EGR valve stuck open
Plugged EGR vacuum regulator solenoid vent
Plugged EGR tube
Slow responding D.P.F. EGR sensor
Damaged DPF EGR sensor
Improper vacuum hose connection
Plugged vacuum hoses
EGRVR circuit shorted to ground
Damaged EGR vacuum regulator solenoid
Damaged PCM

A DPFEGR PID reading that is greater at idle than during key ON and engine OFF by 0.5 volt or a rough engine idle, may indicate a hard fault.

Sep 2, 2018 | 02:48 PM

Dell Gailey

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Joined: Mar 2017

Posts: 4,770

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From: Utah

https://www.jaguarforum.com/showthread.php?t=72698

Sep 3, 2018 | 01:10 AM

chewyshaun

Thread Starter

Junior Member

Joined: Aug 2018

Posts: 21

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From: Paulton, England

Thank you for the response, I will wade through the info. I know the wires to my egr were fraid by the lid so I think I will start there.
Update, new egr valve with a blanking plate gives me the P0403 and P0405 codes, the old egr with a blanking plate gives me P0401, what should I make of that?

Last edited by chewyshaun; Sep 3, 2018 at 02:32 AM.

May 21, 2019 | 03:09 PM

ragtap

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Joined: May 2019

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From: Spain

Hi,
i have the same error codes. Did you finally fix it?

May 21, 2019 | 03:59 PM

chewyshaun

Thread Starter

Junior Member

Joined: Aug 2018

Posts: 21

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From: Paulton, England

Quote:

Originally Posted by ragtap

Hi,
i have the same error codes. Did you finally fix it?

Hi, I did, it turns out the new egr valve was faulty, I put the original back in and bought a blanking plate off eBay with a bigger 10mm hole and the problem went away. The slightly bigger hole tricked the sensor into seeing sufficient gas flow and so no engine management light.