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UffBrock
Member Since: 18 Mar 2011
Location: Oxfordshire
Posts: 156
  
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| Problem with my NOx - 2016 D4 |
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Well I’ve had 2000 trouble-free miles post-service so I guess, given my past history with this vehicle, that I should consider myself lucky! (Apologies but it’s hard not to be sarcastic.)
Last summer I had a series of warning lights associated with P20EE.00 (64) and (6C) codes - Selective catalyst reduction NOx efficiency below threshold – Bank 1. Also present was a U0447-00 (28) code - Invalid data received from gateway A. In those cases, the only dashboard warning was an amber engine warning light.
Come service time in August (when the car was still just in LR warranty), the Adblue was simply topped up and the codes cleared.
Now I’ve got this lot. First indication was an amber exclamation mark and a text warning about Adblue quality, followed the next day on start-up by the mileage countdown to a no-start situation. The local dealer is, of course, in lockdown. In theory that shouldn’t be a problem as car use should be minimal but it could leave me in trouble if an unexpected essential journey crops up.
Can anyone offer any suggestions as to what might be going on? In particular, where might I find the Oxygen sensor – bank 1, sensor 1. I have seen indications of a Technical Bulletin (LTB01191NAS2) which relates to a P2251.13 code and seems to involve replacing Sensor LR062045 with Sensor LR110458 – but that is US only.
PCM-Engine SDV6
P2BAE-00 (2F) NOx exceedance - NOx control monitoring system
( on 17-04-2020 11:57:35 at 20621 mi )
P2BAE-02 (2F) NOx exceedance - NOx control monitoring system - General failure information -
general signal failure
( on 17-04-2020 11:57:35 at 20621 mi )
P2251-13 (60) Oxygen sensor negative current control - circuit open. Bank 1 - sensor 1 - General
electrical failure - circuit open
( on 08-12-2019 10:25:28 at 19930 mi )
P20EE-00 (60) Selective catalyst reduction NOx catalyst efficiency below threshold - Bank 1
P20EE-00 (60) Selective catalyst reduction NOx catalyst efficiency below threshold - Bank 1
P2BA9-92 (6C) Unknown
( on 17-04-2020 11:57:29 at 20621 mi )
U0146-87 (20) Lost communication with gateway A - Bus signal/message failure - missing a message
P2BA9-00 (28) Unknown
( on 17-04-2020 11:57:29 at 20621 mi )
Any suggestions appreciated.
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 24th Apr 2020 9:56 am |
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UffBrock
Member Since: 18 Mar 2011
Location: Oxfordshire
Posts: 156
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Apologies for the two emoticons - they are not of my making. in both cases an '8' followed by a ')' has converted to an emoticon??
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| 24th Apr 2020 10:00 am |
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johnlad
Member Since: 02 Dec 2016
Location: blackpool
Posts: 406
 
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Had problems recently with my ad blue system with the count down to no start appearing.
I took it to a local LR specialist who updated the ad blue software and it’s been ok since, granted not many miles covered since but it’s good so far.
Cost £78 including vat.
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| 24th Apr 2020 10:02 am |
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NJSS
Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10492
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You say:-
Quote:a text warning about Adblue quality
I assume you mean "quantity" ?
I haven't had this problem, but I read elsewhere about AdBlue problems being solved by a software update.
NJSS Am I Gammon or Woke ? - I neither know nor care.
2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t.
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| 24th Apr 2020 10:05 am |
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johnlad
Member Since: 02 Dec 2016
Location: blackpool
Posts: 406
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No it says quality,
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| 24th Apr 2020 10:08 am |
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NJSS
Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10492
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Interesting that the car is capable of analysing the AdBlue quality.
Do you have a warranty?
Failing which roadside/breakdown cover?
NJSS Am I Gammon or Woke ? - I neither know nor care.
2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t.
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| 24th Apr 2020 10:23 am |
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Washwipe
Member Since: 19 Apr 2013
Location: Bucks Oxon Herts Border
Posts: 3169
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Stops you watering the adblue down.
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| 24th Apr 2020 3:45 pm |
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UffBrock
Member Since: 18 Mar 2011
Location: Oxfordshire
Posts: 156
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Thanks all. I do have an extended warranty (Warranty Direct) and I’m looking in to whether I’m covered under that. I do feel though that, given the NOx codes that were clearly generated whilst in LR warranty, this should be down to LR.
Johnlad, I don’t suppose you know which codes were being generated when you had your problems do you?
I think that I can relate all of my previous NOx error codes to particularly high-exhaust-temperature situations (i.e. towing and/or driving fully loaded on motorways). So one theory is that one of the sensors (logically bank1, sensor1) has been triggering these error codes – whether because it has been failing or because of the way it is monitored by the software. We’ll see.
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| 24th Apr 2020 5:00 pm |
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lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
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You will need to monitor live data.
A lot of the time the sensor saying it it out of range is not itself at fault, but telling you there is a problem with what it is seeing, ie nox sensor saying nox reduction below threshold is simply down to the fact it is not inejcting adblue, therefore not rediucing the nox content.
Adblue injector being blocked used to be a big issue.
Cheap adblue will bite the owner in the  !
Nox sensor failure is dead common on scr systems, very very rare for the scr cat itself to fail.
Not seen a temperature sensor fail yet.
Easy to check nox sensor so long as yu know which wires are power/can etc.
I would say 75 percent of the truck breakdowns at work are after treatment system related.
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| 24th Apr 2020 6:54 pm |
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UffBrock
Member Since: 18 Mar 2011
Location: Oxfordshire
Posts: 156
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Well, the saga continues.
Just in case AdBlue quantity did figure somewhere, I checked the dashboard readout and it indicated there was sufficient only for a few hundred miles (i.e. the same figure as the no-start mileage countdown). Nothing to lose (!) so I topped up using the appropriate LR kit and filler thingy. No change, so no alternative but to wait for Covid restrictions to ease.
The car eventually made it to the dealer last month. Nothing found except an Adblue overfill!! (Note: not an issue the IId is apparently capable of detecting).
My protest that an Adblue overfill, if present, was a red-herring because the only non-dealer Adblue fill post-dated all the NOx related codes, fell on deaf ears. It was as if all those historic codes had been deleted and they’d been working on just the codes they could produce afresh. I predicted that the problem would return – and so it has after only 280 miles with an engine warning light and a repeat of the P2251-13 code.
In response, the dealer wanted the car delivered back; no more codes from me please and they will make an entirely fresh start – i.e. without any of the history of the last two years.
I’ve decided I’ve had enough as there’s every prospect that this code too will not reproduce immediately it’s deleted and so I’d simply end up paying again to have ‘historic’ codes deleted.
In the circumstances, and four months on, I’m starting afresh with a local indi who helped me out with an earlier Disco. If I were to lay bets, they’d be on a replacement sensor.
I worked out that, now at 21000 miles, my average return-to-dealer distance is just a shade over 2000 miles per visit. Enough said.
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| 2nd Aug 2020 3:16 pm |
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fat bloke
Member Since: 07 Aug 2006
Location: OXFORD
Posts: 1243
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You didn't use land rover dealer Marshalls down at Didcot by any chance?. If so not supprised by attitude etc .
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| 2nd Aug 2020 5:10 pm |
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jenseneverest
Member Since: 12 Jun 2017
Location: somewhere
Posts: 765
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we run about 50 euro 6 commercials at work, Nox faults are very regular on all of them, the system is unless all of the very particular elements of the system are met. Driving shorts distances at low speed and low engine rpm dose it no favours at all.
Quote:P2251-13 (60) Oxygen sensor negative current control - circuit open. Bank 1 - sensor 1 - General
electrical failure - circuit open
( on 08-12-2019 10:25:28 at 19930 mi )
Whenever we see "open circuit" faults then unless it is a wiring issue (hardly ever is that the case) the sensor is replaced because it is stuffed. Clearing open circuit faults will always come back.
Any other faults are normally reset and a forced regen carried out,( no idea if you can do that or not of your disco) and if the faults re occur during regen, further diagnosis carried out.....but 9 times out of 10 the fault is cured with a forced regen.
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| 2nd Aug 2020 5:58 pm |
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Gary_P
Member Since: 03 May 2016
Location: Kent
Posts: 1521
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Bit late to this topic but I have the following to add (not sure if it's any help):
I had the Ad Blue quality error and amber light when it was under warranty (actually in my first year). Had not topped up the Ad Blue . LR Rescue did a firmware upgrade and the error went away.
There have been several reported issues with people topping up the Ad Blue resulting in overfilling. There are several topics reported here and even an explanation as to why this happens and why you shouldn't brim it. The Ad Blue item on the LR service checklist says something like " Using the LR approved diagnostic tool check the DEF level"
The service checklist also states (although I suspect they don't do it) that the DEF tank should be drained if the car has done less that 16,000 miles in 2 years. So I suspect Ad Blue can go off. Perhaps this can cause some issues? Gary
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Discovery 4 HSE 2016MY
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| 2nd Aug 2020 7:37 pm |
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Gary_P
Member Since: 03 May 2016
Location: Kent
Posts: 1521
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Just found this topic with an explanation from Steve Norman regarding the potential issues of filling yourself and overfilling.
https://www.disco4.com/forum/filling-adblue-171694.html
Cheers Gary
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Discovery 4 HSE 2016MY
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| 2nd Aug 2020 9:31 pm |
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