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Is there summat I should know about MAF sensors?

Printed From: The Brick-yard
Category: T5 Section
Forum Name: T5 Chat
Forum Description: Forum for T5 specific chat
Printed Date: 08 Aug 20 at 06:35
Software Version: Web Wiz Forums 12.01 -

Topic: Is there summat I should know about MAF sensors?
Posted By: Charlie Dog
Subject: Is there summat I should know about MAF sensors?
Date Posted: 01 Dec 19 at 14:54
The sensor on our T5 is held in 
with anti-tamper screws.

Haynes simply says it's 
a delicate bit of kit.

Aren't all sensors?

So, why have VW used 
anti-tamper screws please?

Posted By: T5 TDI
Date Posted: 01 Dec 19 at 15:50
I think most modern airflow sensors use a film instead of a wire and the film is delicate and can be wrecked by cleaning especially with some chemicals (although most people seem to ignore this.)  VW probably would rather owners left it alone hence the screws.  

A hot wire sensor or a hot film sensor works by the cooling passage of the airflow changing the conductivity across the sensor.  The ECU compares this with a reference voltage to decide how much air is passing the sensor. 

2004 2.5 174

Posted By: Charlie Dog
Date Posted: 06 Dec 19 at 20:41
Thank yuo very much T5 TDI :o)

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