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Could do with some advice - P0089
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hgrimmett
 


Member Since: 11 Oct 2009
Location: Bledlow
Posts: 901

2015 Discovery 4 3.0 SDV6 SE Tech Auto Indus SilverDiscovery 4
Could do with some advice - P0089

So, in the past 6 months or so, the D3 has had, in no particular order, and amongst other things, a new LPFP, HPFP and turbo. This has cured the voracious oil appetite and the Christmas tree shutdowns however, when I read the codes I'm regularly getting a P0089 - fuel pressure regulator maximum amplitude, limit exceeded.

The car has just ticked over 170,000 and the injectors are all at or about 950 - 1050.

I'm assuming that, apart from the fuel injectors, the last thing that needs replacing in the fuel circuit is the pressure regulator on the injector rail. Can anyone tell me if they've had this issue or whether there are any opinions on whether this is worth dealing with since the car is otherwise normal (apart from perhaps slightly poorer performance/ higher mpg)?
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Post #176750422nd Jan 2017 10:45 pm
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20731

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

Pressure regulator is part of the HPFP...

The sensor on the rail is the pressure sensor, which may be giving a false reading...
 My D3 Build Thread

TDV8 Retrofit Build Thread 
 
Post #176751922nd Jan 2017 11:33 pm
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hgrimmett
 


Member Since: 11 Oct 2009
Location: Bledlow
Posts: 901

2015 Discovery 4 3.0 SDV6 SE Tech Auto Indus SilverDiscovery 4

OK, thanks Mikey. The HPFP is a new VDO unit so I'd like to think it's OK, is there any way to diagnose the pressure sensor with an IIDTool? Or should I just bite the bullet and change it?
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D4 '15 (64) Se Tech Indus Silver
Tesla Model Y LR (22)
Audi TT Roadster 225 (52)
Tesla Model 3 LR (70) (gone)
Porsche Boxster '96 2.5 5spd project (P)
Mini R52 S (54)
BMW 330e eDrive MSport '16 (gone)
D3 '07 (56) XS TDV6 Buckingham Blue (gone) 
 
Post #176793223rd Jan 2017 9:20 pm
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