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P0490 Exhaust gas recirc fault code - EGR valves?
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Slacksy
 


Member Since: 15 Mar 2017
Location: Kent
Posts: 3

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Barolo BlackDiscovery 3
P0490 Exhaust gas recirc fault code - EGR valves?

Hi all,

Hoping for a little help & advice regarding a pesky 'check engine' light and the code that my diagnostics software has thrown up.

So I have had a light on the dash for (forgive my negligence here!) a few weeks. I recently got myself a bluetooth ODBII reader and used this to grab the fault code. Here's what I'm face with

P0490 -Exhaust Gas Recirculation "A" Control circuit high


So I did a little digging and found that it's attributable to the EGR valves.
It could simply be a gunked up valve (I've got about 100k on the clock, '07 plate), or possibly any of the following:

Faulty EGR sensor

Faulty EGR solenoid

Faulty MAP sensor

Broken vacuum line

Faulty connectors or electrical wiring

I think it's unlikely to be wiring, it all looks good and the connectors are seated well. I checked along the vacuum line as far as I could without removing any components, looks ok.

That leaves the solenoid, sensor, MAP sensor and the EGR valve itself.

Are there any other relatively pain free things I could check before having to start stripping things down?
I don't know where the solenoids live, so I could check that with some guidance.
The sensor no doubt is part of the valve assembly, so scratch that.
Don't know what a MAP sensor is, sounds unlikely though
The EGR valves are a pain to get at, I don't think I have the tools to lift them out and I'm assuming they're expensive.

Is there any likely culprit above? Or Do you think I should go with the below option?

I looked at getting a £30 blanking kit for the EGR. Do you think this is a worth while option? I think it's highly likely that one or both of them are clogged up to high heaven but as I said, I don't have the tools so I'd probably ask the garage to do the fitment.
  
Post #180667822nd Apr 2017 4:00 pm
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DrRobH
 


Member Since: 10 Oct 2015
Location: Hampshire
Posts: 924

United Kingdom 

You're based in Kent so get in touch with Geoff. on here who will sort you out... Thumbs Up
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RR Vogue SE 2011 4.4 TDV8
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Post #180679622nd Apr 2017 7:57 pm
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df_tom
 


Member Since: 09 Mar 2017
Location: Stuttgart
Posts: 127

Germany 

MAP == Manifold Air Pressure.

Should be cheap. Might hurt the least to try.
  
Post #180697023rd Apr 2017 12:20 pm
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Slacksy
 


Member Since: 15 Mar 2017
Location: Kent
Posts: 3

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Barolo BlackDiscovery 3

Had a chat with Geoff, he knows his stuff for sure.

Will let you all know how I get on
  
Post #180701223rd Apr 2017 3:15 pm
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Skynet
 


Member Since: 23 Jul 2014
Location: Melksham, Wiltshire
Posts: 868

United Kingdom 2016 Discovery 4 3.0 SDV6 SE Auto Alaska WhiteDiscovery 4

What did he suggest? Question
 Dave
D3 2006 HSE, Cairns Blue - gone
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http://www.wessex4x4response.org.uk/ 
 
Post #180705723rd Apr 2017 4:58 pm
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fordeynoel
 


Member Since: 15 Feb 2017
Location: cork
Posts: 1

Ireland 2008 Discovery 3 TDV6 XS Manual Rimini RedDiscovery 3

Can anyone tell me how do you find out which one is giving trouble as I have that code up and don't know which side to start with.
  
Post #184612110th Aug 2017 9:16 pm
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marwak
 


Member Since: 07 Dec 2016
Location: Hrabesice
Posts: 3

Czech Republic 2007 Discovery 3 TDV6 SE Auto Vienna GreenDiscovery 3

Slacksy wrote:
Had a chat with Geoff, he knows his stuff for sure.

Will let you all know how I get on


Have you found the solution? I seem to have similar (or almost same) symptoms and wondering where to start...
  
Post #192561313th Mar 2018 10:26 am
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Adigorn
 


Member Since: 14 Mar 2010
Location: Birmingham
Posts: 546

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

EGR A is the RHS EGR and if its open it would normaly give MAP sensor fault as well, as the pressure will escape through open EGR. I would NOT suspect the wiring issue - time to change/fix EGR me thinks
  
Post #192567213th Mar 2018 1:48 pm
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marwak
 


Member Since: 07 Dec 2016
Location: Hrabesice
Posts: 3

Czech Republic 2007 Discovery 3 TDV6 SE Auto Vienna GreenDiscovery 3

I was thinking the same, but in such case shouldn't it be perceptible in performance of engine? In my case it seems that engine works perfectly without any difficulties and only P0490 appears occasionally (last week more often then earlier).
  
Post #192567413th Mar 2018 1:59 pm
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Adigorn
 


Member Since: 14 Mar 2010
Location: Birmingham
Posts: 546

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

it means your valve is not fully stuck yet. If the valve get stuck in close position you will not have any lack of performance but still the MIL lamp
  
Post #192567713th Mar 2018 2:09 pm
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marwak
 


Member Since: 07 Dec 2016
Location: Hrabesice
Posts: 3

Czech Republic 2007 Discovery 3 TDV6 SE Auto Vienna GreenDiscovery 3

But in such case (if I understand it correctly) - if valve is stuck in closed position, it works generally the same as if EGR is sealed (except of the MIL indication) and there is no significant risk of further negative influence on anything else, right?

I mean - in such case is it urgent to deal with it quickly?
  
Post #192568113th Mar 2018 2:21 pm
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Adigorn
 


Member Since: 14 Mar 2010
Location: Birmingham
Posts: 546

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

In theory yes. it works same as you blank your EGR. It may though open anytime ( most likekly aint) but can. So you do not need to run for it, but id consider sorting out when ready.
  
Post #192568513th Mar 2018 2:39 pm
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