disco sensor problems

ive bought a disco landmark td5 2004 caught out firstly air suspension problem fixed that but theirs no power until it hit turbo then goes like *hit ,i took it and had codes read came back ambient pressure sensor fault checked online for one then decided to clean sensors low and behold theirs no sensor on the airbox the four pin plug is their on the loom but no sensor so i'm guessing this might be the problem,now the dilema is how can i find out part number for the sensor so i can get another 1 ,i got mhk100820 4 pin from breakers of a rover but doesnt fit in the airbox hole can anyone shed any light ,thanks in advance

3 pin (MHK100600) or 4 pin(MHK100820) when you are standing in front looking at the engine the air filter box is in your right, the sensor is fitted to the left side of the air filter box.

therealboss said:

3 pin (MHK100600) or 4 pin(MHK100820) when you are standing in front looking at the engine the air filter box is in your right, the sensor is fitted to the left side of the air filter box.

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yes i know were it goes and the loom has the multiplug with 4 pins but got a mhk100820 and it wouldnt fit in hole on airbox ive phoned loyds landrover and they said theirs two aswell but couldn't say how many wires each had ,the plug has 4 pins but the 4 pin sensor wont go in the hole haha so gonna have to have a better look tonite after work might be a case of 4 pins on the plug but only 3 wires dont know im new to these sensor stuff

well update got the mhk100600 thats the right one for the airbox but the multiplug is for the mhk100820 so only thing i can think of is the airbox has been changed so drilled the hole bigger and fitted the 100820 seems to be going better now with sensor fitted pulls away better low down also blanked egr but still find a blank spot before turbo kicks in theirs a fine line but when the turbo comes in the power is unreal for a diesel ,just need to hold of the gas in town as it takes of lol .think i'll just have to live with it ,

Check the throttle position sensor too then.