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Discovery 4 sdv6 MAF sensor fault
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Coastie02
 


Member Since: 07 Jan 2021
Location: Peacehaven BN10
Posts: 2

England 2012 Discovery 4 3.0 SDV6 HSE Auto Aintree GreenDiscovery 4
Discovery 4 sdv6 MAF sensor fault

2012 Discovery 4 sdv6.
Should both MAF sensors read equal on idle or do they operate at different times, bank 1 has a reading of 0 and bank 2 reads 13 ish, it's not coming up with a fault though only come across this by fixing fingers crossed and clearing the fault I did have of restricted power which came up as Exhaust Gas Recirculation Throttle Position Control Range/Performance. Series 2 truck cab .. gone
Discovery 1 200tdi... modified to trials buggy.
Defender 110 300tdi... still got
Defender 110 tdci 2.4 utility....sold
Range Rover Vogue L322 td6... sold
Range Rover Sport Hse L320 3.6 tdv8... still got  
Post #22092759th Feb 2021 9:59 pm
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Pimpintgepidge
 


Member Since: 17 Sep 2019
Location: Glossop
Posts: 131

I had restricted performance recently and it was the front maf and I’m sure the garage was saying the front did upto 3k revs then the second plays at part at the higher revs. Don’t quote me on it, but would make sense of your readings. We also looked at readings and they seems good but changed the sensor on the off chance and it worked immediately. 2015 D4 HSE Loire Blue  
Post #220934010th Feb 2021 7:58 am
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Coastie02
 


Member Since: 07 Jan 2021
Location: Peacehaven BN10
Posts: 2

England 2012 Discovery 4 3.0 SDV6 HSE Auto Aintree GreenDiscovery 4

Hi.
Front MAF working fine bank 2, rear bank 1 I've replaced it but still reads the same. Series 2 truck cab .. gone
Discovery 1 200tdi... modified to trials buggy.
Defender 110 300tdi... still got
Defender 110 tdci 2.4 utility....sold
Range Rover Vogue L322 td6... sold
Range Rover Sport Hse L320 3.6 tdv8... still got  
Post #220934110th Feb 2021 8:06 am
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Miffed_G
 


Member Since: 30 Nov 2020
Location: Suffolk
Posts: 22

United Kingdom 2012 Discovery 4 3.0 SDV6 XS Auto Santorini BlackDiscovery 4

I'm sure you've got this sorted now - however if you haven't - for info. The TDv6 3.0 engine has a twin turbo system. One is the cruising turbo (right hand side of the engine if your standing in front of the car) which is fed air from the bank closest to the front of the car. At ~2800rpm the secondary turbo (located on the left hand side of the engine) kicks in and pulls air in through the secondary air supply (the second rear maf sensor) the two turbo outlets are then mixed together in an intelligent way before going through the intercooler and into the inlet manifolds.

You cannot really diagnose the issue with just reading the MAF sensors output. As people have suggested look for a garage with a smoke machine - the engines are renowned for having cracked manifolds which will present the fault you describe, or it could be a split hose either way a smoke machine is your friend.  
Post #226136810th Nov 2021 6:26 pm
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