Hi my l322 is showing restricted performance only does it when joining motorway etc goes away when I turn ignition off fault code I’m getting is P040D exhaust gas recirculating temperature sensor is this the map sensor on top of the inlet manifold cars a 2012 tdv8 westminster

Get a HIGH pressure smoke test done. That will show you your leak - could be split inlet manifold (they are known for it)

As above, smoke test to see if you have a split hose/plenum or manifold.
You'll find a load of info on here using the "Search" button on the cause of RP
I'd be checking the 4 inlet hoses are the upgraded silicone ones as a quick and easy first step.
P040D is the exhaust manifold temp sensor on passenger side and doubt it's related to the RP from forum history. See "Wiki" page for how to replace that sensor. It's a bitch of a job. I got a specialist to do it. Use MMP in Dundee (Mike Park).
Welcome to the mad house  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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Thanks for the replies will check the hoses etc at the weekend looks like it’s all the original hoses still on it only started doing it a couple of weeks ago as drove it on the motorway when I bought it and didn’t do it cheers Mitch

My 2012 Westminster was doing the same thing a few weeks ago. I got the sensor replaced, which was the egt sensor in the manifold, but the restricted performance message came back. The PO40D code didn’t come back though

I made the mistake of not previously code grabbing with the fault ‘live’. I hope you’ve done this, because the PO40D is a common one and rarely the cause of running problems.

In my case the live code grab came back with P2264-OO (2F) water in fuel sensor circuit so I’m replacing filter and sensor as soon as it warms up.

Good luck!

I've stolen Ninos picture to help explain.





The pipes shown by the red arrow are vacuum pipes,they are prone to perishing/collapsing.Check that they are all in place because when they perish they can either collapse under vacuum or slip off their fitting.It sounds like your problem is the turbo change over actuator,switches at 2500rpm and if it can't the car goes into restricted performance.
I have a 2012 Westminster and mine has just done the same as yours and my problem was the vacuum pipes coming off.Might be something else completely but it costs you nothing to check them.

Hi thanks for the help I had a quick look at the 4 rubber hoses that go to the plenum only managed to get one off as it was getting dark I’m planning to remove and check all above mentioned on Saturday I’ll check those hoses too general as maybe Iv knocked something as I serviced it the other week just after I got it thanks agin Mitch

MAP is manifold absolute pressure..
Try cleaning the MAPT (Manifold absolute pressure and temperature) sensor.
5 minute job and costs nothing, so nothing to loose.
It’s the one sitting in the plenum.
Full details and description in the workshop manual.

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

https://www.fullfatrr.com/forum/topic47735.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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Also check the MAF sensors on the air filter box outlets. The error may refer to a mismatch between the actual air mass measured by them and the calculated airmass from pressure (MAP), temp and RPM. 2012 TDV8 Vogue (L322)

Nice. As a matter of interest have you checked that your cross over valve for turbos at base of radiator has been upgraded from the early “nut” design? You can just about see it if you peer down the radiator area off centre right. Plenty of info on here. Search CSOV
Done it for you
https://www.fullfatrr.com/gallery/albums/u..._TOPIx.pdf 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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Hi mate I haven’t checked that is that done under recall?