Wow - I've just read all of this thread - interesting reading.

Mid-November I purchased Stuarts faulty 2011 TDV8 4.4 autobiography black. For one reason or another (postal strikes/number plate cock-up/needing to sell the old td6 and christmas) we haven't driven it. However on Monday I've had the opportunity to really start fault finding with it.

The gap tool throws up exactly this error - pretty much permanently. The car also goes into restricted performance mode occasionally, and I can be driving along, with the gap connected, clear that particular fault and the car returns to normal. I can guarantee every time it'll do this, clearing this one engine fault sorts it. I've had the missus drive it whilst watching all the stats on the gap and can clear it on the fly no problem.

However its also (very occasionally) throwing a dpf full sign - gap reports it as being full, and I suspect its not doing any regens.

My current plan is to try and find someone to take the dpf off and cleaning it completely and replace that sensor. I'm not sure whether to tackle the job myself or find a decent dealer or indy to do it.

But, I just wanted to say this thread has help immensely, thanks. 2010 L322 Autobiography Black Edition
1975 Land Rover

24valve it's been while since I saw this thread light up. It was a huge journey.
But I am sure 98.999% this is not the cause of your DPF problems (and restricted).
9.5 times out of 10 it is a boost leak. Start with the donut hoses and also the throttle body seal and also the CSOV valve

If you can sort the cause of the high soot then you will be able to successfully be able to regenerate your DPF through driving and you can hopefully leave the DPF on your car.

If you want you can read the guide (in the wiki area) to changing that sensor if you are inclined but whilst very satisfying to have the error code removed, did very little else.

. Cheers, Greg
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2011 Vogue SE 4.4 with lots of toys in Stornaway

Last edited by GGDR on 7th Jan 2023 7:40am. Edited 1 time in total

Mine had this fault, after reading this thread I decided not to bother trying to change the sensor - it was the throttle body, now all fixed and running fine, albeit still with the fault code.

You can check out this guy on YouTube O'Rileys Autos - Mobile Mechanic & DPF Cleaning

You could also get a new sensor and plug it in without removing the old one from the manifold and see if that helps look at the OP above and see what he has done. 2017 SDV8 4.4 silicon silver AB
2012 TDV8 4.4 Stornaway Grey AB
2011 TDV8 4.4 Buckingham Blue
2012 VW V6 3.0 Tougreg

Thanks GDDR. I'll have a check at the leaks as your suggestion, but what I dont understand is the correlation between the restricted performance and the error code for the sensor and that being the only one clear to clear the fault and carry on.

I do understand the boost leaks can cause problems, but I'd have thought the problems would be almost permanent - and on ours it isnt. I can do 20 miles and it be faultless, and as it did yesterday, just starting it popped the restricted performance message up.

My other thought was, if I just unplug that sensor, and the problem doesnt occur, would that at least eliminate the boost leaks. 2010 L322 Autobiography Black Edition
1975 Land Rover

having had a few boost leaks I can say they don't show up as an error. Don't know why not.

Quote:

I can do 20 miles and it be faultless

might be less boost pressure, if you are pootling about then it's not under as much pressure than with say both turbos spooled up

good luck



. Cheers, Greg
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2011 Vogue SE 4.4 with lots of toys in Stornaway

24valve wrote:

Thanks GDDR. I'll have a check at the leaks as your suggestion, but what I dont understand is the correlation between the restricted performance and the error code for the sensor and that being the only one clear to clear the fault and carry on.

I do understand the boost leaks can cause problems, but I'd have thought the problems would be almost permanent - and on ours it isnt. I can do 20 miles and it be faultless, and as it did yesterday, just starting it popped the restricted performance message up.

My other thought was, if I just unplug that sensor, and the problem doesnt occur, would that at least eliminate the boost leaks.

Ive been having an issue like this with my own after doing the intake pipes. Think i may have broken a wire or something but ill have a better look once i get a voltage meter onto the sensor.

It was initially showing code:

intermittent P0401C which is exhaust gas recirculation EGR temperature sensor B circuit low.

This seems to be the sensor which is No4 on the diagram on page 1.

When i unplug this sensor from the connector at the back of the engine the fault code will change to

intermittent P041D - exhaust gas recirculation EGR temperature sensor B circuit high.


Fingers crossed that fault code identifies the sensor at the top of the engine on the EGR.


This sensor seems to be causing my car to go into the yellow restricted performance mode and throws up another fault saying cold start engine exhaust temperature too low. L322 / 2010 / 4.4 TDV8

I know you're not getting the P040 error, however take a quick check with a multimeter of the Exhaust Gas temperature sensor on the manifold (considering the plug is right at the top of the engine and it only takes a minute)

Click image to enlarge

Is that on the RHS right at the back behind the last intake pipe?

ive the oil pipe seals to do at the weekend so ill test those sensors with a meter.

Fingers bloody crossed its that top sensor! Maybe being optimistic when the fault changed when it was plugged and unplugged. L322 / 2010 / 4.4 TDV8

It's passenger side, right at the back of the engine block. Use that bracket as a reference point.

Even if it isn't that sensor, at least you can rule it out.

I'd also do the same with the sensor you've already unplugged - test the resistance.

When I got a 'signal high' error through IID, the sensor had actually gone open loop. 2015 Range Rover Autobiography 4.4 SDV8

Anyone on here taking on the job of swapping the sensor?

Based in Lancashire but can travel for someone who is willing to tackle it. My local garage seemed to want to run a mile. And the specialist were also wary of it!

Cheers

This is very annoying, when these places have the skill/tools and charge hourly rates we could only dream of. 2015 Range Rover Autobiography 4.4 SDV8

Anyone ever figure out numbering of the exhaust temp sensors? I got an error now on my euro 5 2013 L405 but the error doesn't make sense when reading live values.

Click image to enlarge

B1S3 is the one after the DPF.