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P0171 and P0174
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kels83
 


Member Since: 26 Aug 2010
Location: Texas
Posts: 11

United States 2006 LR3 5.0 V8 HSE Auto Java BlackLR3

The gas station i used said 10% ethanol but the shop chemically tested it at 20%. Seems the fuel was diluted Censored

Based on what my shop said about landys I'd suggest you run a fuel treatment with water remover for a few days before ruling fuel out as a problem. I had the codes come back for a couple days, but they're still long gone.
  
Post #17994953rd Apr 2017 8:23 pm
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ScotInNewMex
 


Member Since: 03 Aug 2016
Location: New Mexico
Posts: 21

United States 2005 LR3 4.4 V8 HSE Auto Buckingham BlueLR3

Finally got a new MAF sensor fitted, mil reset, fingers crossed!!
 Exiled Scotsman
2005 LR3 HSE
POD trailer brake controller, 4 and 7 trailer plug harness fitted 
 
Post #180821226th Apr 2017 5:39 pm
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geoffsnook
 


Member Since: 13 Jun 2014
Location: south wales
Posts: 3169

Wales 

Keep us informed i get these codes on mine but it seems to come up when stationary most times but now you mention it my screw on one side does not grip properly Thumbs Up
 Discovery 3 se gone
Range rover sport supercharged here:) 
 
Post #180822026th Apr 2017 5:51 pm
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ScotInNewMex
 


Member Since: 03 Aug 2016
Location: New Mexico
Posts: 21

United States 2005 LR3 4.4 V8 HSE Auto Buckingham BlueLR3

ScotInNewMex wrote:
Finally got a new MAF sensor fitted, mil reset, fingers crossed!!
well that lasted 50 miles... Crying or Very sad Exiled Scotsman
2005 LR3 HSE
POD trailer brake controller, 4 and 7 trailer plug harness fitted 
 
Post #180867027th Apr 2017 7:10 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10336

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

what sort of large air pipe do you have from the airbox ?

It is a rigid one that doesn't seal very well ?
  
Post #180867927th Apr 2017 7:21 pm
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kels83
 


Member Since: 26 Aug 2010
Location: Texas
Posts: 11

United States 2006 LR3 5.0 V8 HSE Auto Java BlackLR3

Had the problem return and got some great advice and successfully fixed again... details at https://landroverforums.com/forum/lr3-28/p0171-p0174-codes-86034/

In short:
1) the engine adaptation values seem to be sustaining the error codes after the issue is fixed. Get an odb2 tool that can reset engine adaptations to quickly clear the error codes.
2) metal gaskets on the EGR valve may leak in colder weather, so try some gasket maker on these
3) my egr feed pipe (metal tube that connects exhaust to the egr valve) had vibrated lose at the exhaust side on the back of the engine bay. I tightened with ~1/2 turn on each bolt.

Not sure if #2 or #3 was my problem. I fixed both at the same time in about an hour, then reset adaptation values and the code has not returned. I was able to pass inspection and am legal again! I attached a diagram that shows both metal gaskets and the EGR valve feed pipe.
  
Post #18990568th Jan 2018 7:03 pm
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kels83
 


Member Since: 26 Aug 2010
Location: Texas
Posts: 11

United States 2006 LR3 5.0 V8 HSE Auto Java BlackLR3

Pete K wrote:
what sort of large air pipe do you have from the airbox ?

It is a rigid one that doesn't seal very well ?



Mine is a plastic housing with a ~3 inch rubber grommet. I've heard the air box can crack at the seam, but mine passed a smoke test.
  
Post #18990578th Jan 2018 7:05 pm
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kels83
 


Member Since: 26 Aug 2010
Location: Texas
Posts: 11

United States 2006 LR3 5.0 V8 HSE Auto Java BlackLR3

Quick update, the lean codes haven't returned so I can confirm the steps in my last post are a permanent fix for my specific problem.
  
Post #198396217th Sep 2018 2:32 am
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