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Cosmo15555



Member Since: 24 Jun 2014
Location: Stevenage
Posts: 163

United Kingdom 2010 Range Rover Sport Supercharged HSE Stornoway Grey
Sport 5.0s/c

I have the engine management light on the fault code is
P0171-00 (AF) System too lean (bank 1)
When I drive the car it feels like no difference in power
Has anyone got info on the problem
Thanks
Cosmo

Post #624050 Thu May 05 2022 9:28pm
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Cosmo15555



Member Since: 24 Jun 2014
Location: Stevenage
Posts: 163

United Kingdom 2010 Range Rover Sport Supercharged HSE Stornoway Grey

I’m still trying to find the problem

Post #624497 Wed May 25 2022 10:41pm
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Col



Member Since: 02 Sep 2012
Location: Hawkes Bay NZ
Posts: 4968

New Zealand 2013 Range Rover Sport Supercharged Autobiography Santorini Black

Could try swapping MAF sensors over bank 1 to bank 2 and visa-versa, if code changes to P0174-00 would indicate a faulty MAF sensor, as code refers to MAF and Cat sensors, also possible air leak on air intake system. The two sensors are identical and interchangeable just look different as they are mounted at different angles. Only a suggestion.

Cheers
Col

Post #624498 Wed May 25 2022 11:33pm
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Cosmo15555



Member Since: 24 Jun 2014
Location: Stevenage
Posts: 163

United Kingdom 2010 Range Rover Sport Supercharged HSE Stornoway Grey

I’ve not been in a hurry to remedy this as not caused any problem with performance
Sometimes I reset the engine light and no problem for a couple of weeks but then I’ll reset and comes straight back on
I’ve done a live data on both mass air flow sensors and getting different readings as shown in photo
Is this normal



Thanks
Cosmo

Post #625987 Sun Aug 07 2022 4:18pm
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Andy K



Member Since: 18 Sep 2015
Location: GL
Posts: 4940

England 2005 Range Rover Sport TDV6 HSE Rimini Red

well -30 seams a silly value.
But worth someone else with the same engine checking, incase its a GAP problem.

next time check the long term fuel trims for bank 1 and bank 2

should be about 0-4
When it gets near 20, the light comes on

Post #625989 Sun Aug 07 2022 4:46pm
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Cosmo15555



Member Since: 24 Jun 2014
Location: Stevenage
Posts: 163

United Kingdom 2010 Range Rover Sport Supercharged HSE Stornoway Grey

As I look at the car from the front which side is bank 1

Post #625992 Sun Aug 07 2022 11:02pm
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Col



Member Since: 02 Sep 2012
Location: Hawkes Bay NZ
Posts: 4968

New Zealand 2013 Range Rover Sport Supercharged Autobiography Santorini Black

L/H side. R/H when sat in drivers seat.

Cheers
Col

Post #625993 Sun Aug 07 2022 11:21pm
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Cosmo15555



Member Since: 24 Jun 2014
Location: Stevenage
Posts: 163

United Kingdom 2010 Range Rover Sport Supercharged HSE Stornoway Grey

Thanks for the info

Post #625994 Mon Aug 08 2022 6:44am
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Cosmo15555



Member Since: 24 Jun 2014
Location: Stevenage
Posts: 163

United Kingdom 2010 Range Rover Sport Supercharged HSE Stornoway Grey

I’ve cleaned the mass air flow sensors and still getting same reading so I swapped the sensors over and still the same reading as before
I checked the long term fuel and the readings are


Post #625996 Mon Aug 08 2022 5:22pm
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Cosmo15555



Member Since: 24 Jun 2014
Location: Stevenage
Posts: 163

United Kingdom 2010 Range Rover Sport Supercharged HSE Stornoway Grey

Checking other different live values I’ve found this

Post #625997 Mon Aug 08 2022 5:58pm
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Cosmo15555



Member Since: 24 Jun 2014
Location: Stevenage
Posts: 163

United Kingdom 2010 Range Rover Sport Supercharged HSE Stornoway Grey

After doing a lot of research on web some people saying pcv diaphragm can cause the same fault codes
I’m getting a noise I can only describe as when you blow through a fag paper getting a vibrating sound
I can also hear a hissing sound coming from around the area of the diaphragm’s
If this could be the cause has anyone changed them on the 5.0 supercharged engine

Post #625999 Mon Aug 08 2022 7:07pm
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Andy K



Member Since: 18 Sep 2015
Location: GL
Posts: 4940

England 2005 Range Rover Sport TDV6 HSE Rimini Red

If you have a hisssing then fix it

Last edited by Andy K on Tue Aug 09 2022 2:37am. Edited 1 time in total

Post #626000 Mon Aug 08 2022 7:17pm
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Lrstaylor



Member Since: 10 Mar 2022
Location: Kent
Posts: 342

United Kingdom 2006 Range Rover Sport Supercharged Bali Blue

Post #626001 Mon Aug 08 2022 9:16pm
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