P040D-00 - EGR temperature sensor A - circuit high (2B)
2011 4.4 TDV8

So this had been intermittent for some time but is now a permanent fault code.

Is this the well-known temperature sensor down the side of the EGR pump on the right hand side (as viewed facing forward) of the engine? I see lots mentioning 2F but not 2B.

I also recollect someone writing a guide?

My donut is all good, my charge hoses are good and my throttle body union repair is holding up. I also don't get any restricted performance. 2015 Range Rover Autobiography 4.4 SDV8

I’m keen to nail this down too. I don’t have that fault code and never have, but do have EGR issues atm so am on my own investigative journey to discover how the system works and what triggers what.

My current understanding from the other main P040D threads, is that EGR temp sensor A is the exhaust temp sensor that sits on the top rear of the exhaust manifold that is on the side of the engine with the secondary turbo (so near-side for RHD cars). This sensor measures the temperature of the exhaust gas, before it goes through the crossover pipe and enters the EGR. EGR temp sensor B would then be the one in the ‘V’ of the engine, on the pipe that runs alongside the oil cooler and EGR assembly on the primary turbo side (off-side on RHD cars). This measures the exhaust temp after the EGR cooler and before the gas enters the air intake to be recirculated. Therefore, these two sensors give the before and after measurements that allow the ECU to make decisions and instruct actions elsewhere, such as opening valves and stuff in the EGR.

The threads I’ve read don’t seem to give a definitive issue on what happens if you get the P040D code, i.e. whats the observable symptom if any? What does this effect/impact/prevent happening that should.

Some have suggested DPF but this seems to have been ruled out on the other threads. I’m not sure either way. EGR operation would surely be impacted but I don’t know how and whether that is a good or bad thing.

Looking forward to hearing others’ contributions on this as better knowledge is always a good thing with these vehicles! 👍 Andy

2010 4.4TDV8 Vogue SE in Santorini Black with Ivory interior
2017 Audi SQ5 3.0 V6T Quattro in Volcano Red
2001 Audi Allroad 2.5 TDI manual with low-range in Highland Green. Currently SORN whilst undergoing some serious restoration!

Gary - it might be in the Wiki iirc 👍 Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
New Defender D300 90
1974 Series 3 Lightweight = "Millie"
My preferred specialist: www.glenrands.co.uk
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garyRR wrote:

P040D-00 - EGR temperature sensor A - circuit high (2B)
2011 4.4 TDV8

So this had been intermittent for some time but is now a permanent fault code.

Is this the well-known temperature sensor down the side of the EGR pump on the right hand side (as viewed facing forward) of the engine? I see lots mentioning 2F but not 2B.

I also recollect someone writing a guide?

My donut is all good, my charge hoses are good and my throttle body union repair is holding up. I also don't get any restricted performance.

Mine's been intermittent for some time but now returns as soon as I clear the fault. Again, no issues flagged on the dash.

I haven't been able to decipher which of the sensors the fault refers to, however know it is likely the one on the right side exhaust manifold, down the side of the EGR. 2015 Range Rover Autobiography 4.4 SDV8

Ok, I have only had the car just over a week, its going in to a local specialist and I will sound him out about it and report what he says if its worth replacing the sensor or just ignoring the fault. Current
2011 4.4TDV8 VSE
1972 MGBGT
Gone
2004 Discovery Landmark 2.5D
2003 Freelander TD4 SE

Surely it has to affect Dpf as doesn’t the regen work off the exhaust temp as when to work?

There's 4 different exhaust gas temperature sensors - the ECU will likely be programmed to take the readings it has and take a default value for a faulty sensor.

The following guide with photos surfaced on the forum the other day: https://www.fullfatrr.com/forum/topic50202.html

I'll replace mine in the next couple of weeks and post the result. 2015 Range Rover Autobiography 4.4 SDV8

I have a Dpf full warning and only other fault I have on gap is temp sensor and on a run my soot count is rising

So as an update have a egr error code not giving restricted performance at present but apparantly could on a long run, I went to a 4x4 specialist who has advised that it's not a sensor and that in fact he advised to replace the throttle body, just thought I would share this. Collecting a new throttle body today from main dealer so will update again if this fixes the issue. Current
2011 4.4TDV8 VSE
1972 MGBGT
Gone
2004 Discovery Landmark 2.5D
2003 Freelander TD4 SE

To fix a P040D-00 error code or a different code?

P040D specifically relates to exhaust gas temperature, not throttle body. Be very wary of the advice from the specialist.

Before you unbox it, i'd spend 5 minutes and unplug the exhaust gas sensor multiplug (pictured in my guide: https://www.fullfatrr.com/forum/topic67357.html) and put a multimeter on it and check the resistance. You could save yourself a significant bundle of money, as you won't be able to return the throttle body once opened. 2015 Range Rover Autobiography 4.4 SDV8

garyRR wrote:

There's 4 different exhaust gas temperature sensors - the ECU will likely be programmed to take the readings it has and take a default value for a faulty sensor.