Hi Guys

So DPF Temp Sensor A has bitten the dust and needs replacing
No dpf regen happening while the fault code is in place

So here's the issue - I've been to 2 garages and I'm reading it that they have both shied away from the job because they fear the sensor bolt snapping.
It must be easier money just sticking to oil services

I live in Cheshire. Does anyone know a mechanic that
A. Would be willing to take the job on ........ and
B. Wont force me to remortgage to pay for it

Cheers folks
All the best 2011 TDV8 4.4 Vogue SE

P040D? That’s the EGR temperature sensor. Shouldn’t affect a DPF regen.

P040D-00 (2F) Exhaust gas recirculation temperature sensor A

as far as I understand Pete .... if this sensor fails a Dpf regen cannot be forced .... the garage have tried 2011 TDV8 4.4 Vogue SE

I think this explains it better Pete
Its from an excellent post by GGDR explaining the process to identify and change the sensor



This error is common on the 2011-2012 4.4TDV8 L322 and the early SDV8 L405s. At some point the part was revised and that seems to have dealt with it. The part below is the revised part fyi.

You can read in the above thread the full journey to discovery, but in summary the main trap that many including some indy mechanics, (possibly even some MD’s) fall into is that the error code says EGR sensor. So they head there. But Sensor A is nowhere near the EGR, it’s on the NS exhaust manifold. This has led to many changing the sensor on the EGR (sensor B), having the error return and people writing this off as a "ghost" code. So they leave this error present under the "they all do that" category. Others have changed their whole EGR. Possibly unnecessarily. 2011 TDV8 4.4 Vogue SE

Myself and others have had this fault code for years with no problems at all. Maybe there’s some other reason why it won’t regen. Is the Red DPF light on? I changed mine last year so i know which sensor it is.

No red light on Pete

The PDO40 fault code came up ...... then came the explanation that it was a failed temp sensor and hence the Dpf will not regenerate as the required temp for regen can no longer be recognised

I'd be delighted if I could just leave it

so if the fault code PD040 does not affect a regen do you know if the failed sensor A is essential to any process at all?

Many thanks 2011 TDV8 4.4 Vogue SE

If it’s running ok and that’s the only engine fault code I’d leave it. Mine was on for years with no affect at all. I only decided to change it to get rid of the fault code. Do not try to do a forced regeneration with no reason to.

Not sure I would feel comfortable leaving it Pete ...... just found this bit of info .....



If the EGR Temperature Sensor A has failed on your 2011 Range Rover L322 TDV8 4.4, it can cause a range of issues — some mild at first, but potentially serious over time, especially regarding emissions control and DPF regeneration.

🔧 Immediate Effects of a Failed EGR Temp Sensor A:
Incorrect Exhaust Gas Temperature Readings:

The ECU relies on this sensor to monitor EGR gas temperatures.

If it’s failed, the ECU either gets no data or incorrect data.

Improper EGR Operation:

The EGR valve might stay open or closed at the wrong times.

Can lead to rough idling, hesitation, or increased NOx emissions.

Check Engine Light (MIL) and Stored DTCs:

You’ll likely keep seeing a fault code like P040D or P040E.

The system may go into a restricted performance mode if the issue persists.

⚠️ Long-Term Consequences if Not Replaced:
Disrupted DPF Regeneration:

The sensor helps determine if exhaust temps are suitable for DPF regeneration.

Without it, passive or active regen may not trigger properly, leading to soot buildup in the DPF.

Eventually, this may cause DPF clogging, high backpressure, and even forced limp mode.

Engine Efficiency Loss:

Bad EGR temperature data can affect combustion timing and fuel-air mix.

This results in worse fuel economy, possible smoking, and reduced power.

Turbocharger and EGR Cooler Stress:

Improper EGR flow can raise exhaust temps elsewhere, increasing thermal stress on other components like the turbo and cooler.

✅ Recommended Action:
Replace the EGR Temp Sensor A as soon as possible.

They're generally not expensive, and replacement is relatively straightforward (depends on access).

After replacement, clear the code and check live data to confirm it’s working. 2011 TDV8 4.4 Vogue SE

It’s ten years since I bought my Gap iid and the PO 40 (D) was showing then , and is still showing now.

My trusted local independent LR garage owner was adamant that it would prevent any forced DPF regen from working, but when the iid was eventually updated to allow forced regens I decided to try it just to test it and lo and behold it worked perfectly, and has continued to work whenever I needed it.

Cheers
Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

Thanks mike

This RR World is very confusing  2011 TDV8 4.4 Vogue SE

That usually does not impact DPF regenerations. Have you had any yellow DPF warning lights? If not, carry on
Henshalls Engineering is worth a call if you want it replaced. Proper mechanics
Or DIY https://www.fullfatrr.com/forum/topic67357.html Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
2025MY Defender D350 90 in Silicon Silver on coils
1974 Series 3 Lightweight = "Millie"
Many, many other Landies over the years
My preferred specialist: www.glenrands.co.uk
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+1 for the "leave it alone" gang
My 2011 4.4 had this code when I bought it, 9 years and 100K miles later it's still got it and it never caused a problem yet. probably will now I've said that!

In the 5+ years of having the P040D-00(2F) fault on mine I’d never in that time had a yellow or red DPF warning. No problems with regenerations or running issues at all.

Dr Rob ..... I've been in touch with James today ... just waiting for him to call back to get his take on this

i have had yellow DPF warning light on several occasions and always managed to clear them. Just a consequence of short journeys unfortunately. 2011 TDV8 4.4 Vogue SE

My L322 4.4TDV8 had that error code (P040D-00 (2F) Exhaust gas recirculation temperature sensor A ) and I was very upfront about it when I sold the vehicle. Even reflected it in the price (looking back, I sold that car wayyyy too cheap though).

It ran for several years with that code stored, with no adverse impact to mpg or DPF regens - I used to monitor them both closely. Don't think the buyer is a regular on here, but I'm sure he's had two further years without any issues relating to that code.

If it bothers you, get it sorted, but many forum users here live with that code. It doesn't flag any warning lights on the dash, it's just visible when you read the ECU with a diag tool.

Jon 1992 RR Classic 3.9 efi Vogue
2014 Disco 4 HSE
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