Good morning everyone, so for the past 2 days upon starting the RR it shows the above message, after the dreaded "bong". Suspension feels ok to drive so my partner took it to work and back, ive finally done a diagnostic on it and it shows these issues...

C1A13-64 Intermittent Pressure does not decrease when venting gallery

C1A18-64 Intermittent Pressure increases too rapidly when filling reservoir

U0401-86 History Invalid data sent from ECM/PCM

C1A20-64 Intermittent Pressure increases too slowly when filling reservoir

Ive taken the cover off the pump in the boot to look at it, i believe it to be the Hatachi model, "the lid" has what looks like old water marks (dirty brown) streaks running down the foam covering. Ive also noticed i have no "brass venting filter", its not on the floor/boot and it looks like it has broken off at the attachment point to the assembly. So its obviously been missing since we bought the L322.

Ive done some research and it suggests that the fault is the air pump, so i know they do repair kits for the earlier pumps, up to 2005 ect, do any members have any experience of finding and replacing the seals ect on the Hatachi pumps? I can see from looking around that there are some on eBay, and 4x4 Air pump seals sell kits online. But id prefer to hear if anyone has done this and how they went on.

Regards
Tiprat Borrowed Grey 2002 3d 204k for a year
Now own a 2007 Java black Vogue SE 3.6TDV8 160k

I rebuilt my Hitachi compressor using a kit I bought from a seller on eBay. It appears to be exactly the same kit as sold by other vendors at a higher price; all I can say is that it's transformed my EAS.

Where it used to generate overheat/raising slowly messages it now fires up to height with alacrity since the rebuild.

https://www.ebay.co.uk/itm/274409452200 2012 (L322) 4.4TDV8 Vogue SE, RSE, Fuji White over Arabica.
Previous V8s: BMW 645Ci, P38 4.6, P38 4.0, Merc CL500
Previous others: Honda x1, Volvo x7, Rover x6, BMW x6, Ford x1, Mercedes x2, Skoda x3, VW x2, Renault x2, Citroen x1, Mazda x3, Nissan x1, Audi x3, Kia x1, Fiat x4, Subaru x3, Austin x2, Triumph x2, Jeep x2, Hyundai x2, Lexus x1, Mitsubishi x1, Saab x2... and some others I've forgotten!

Thank you for your reply Danb that's very helpful, I shall certainly be ordering a kit to rebuild the pump. I'm guessing that there were no issues rebuilding the pump ect?

On a side note whilst taking the pump off its 4 chassis bolts I found the "cone brass filter" it looks like it's been snapped off at the end of the threads. Do I need a new one of these or do they not necessarily need to be there?

Regards
Tiprat Borrowed Grey 2002 3d 204k for a year
Now own a 2007 Java black Vogue SE 3.6TDV8 160k

I looked at the kit on eBay and it looks comprehensive, but are there instructions on how to fit the components included?

Yes, and videos on YouTube - not from the seller I used, but the fitting procedures are all the same. 2012 (L322) 4.4TDV8 Vogue SE, RSE, Fuji White over Arabica.
Previous V8s: BMW 645Ci, P38 4.6, P38 4.0, Merc CL500
Previous others: Honda x1, Volvo x7, Rover x6, BMW x6, Ford x1, Mercedes x2, Skoda x3, VW x2, Renault x2, Citroen x1, Mazda x3, Nissan x1, Audi x3, Kia x1, Fiat x4, Subaru x3, Austin x2, Triumph x2, Jeep x2, Hyundai x2, Lexus x1, Mitsubishi x1, Saab x2... and some others I've forgotten!

just buy a new pump on eBay mines been in now for 3 years about £150 new vehicle purchase
2007 supercharged 4.2 java black .sand leather vogue se trim
previous cars .
range rover classic 200 tdi
discovery 1 200 tdi
freelander 2 2008 hse
discovery 1 300 tdi
p38 4.0 ltr man r380 ex royal support vehicle on v5c
discovery td5 man off roader