I need to replace my Mass Air Flow sensor, as I have been browsing around the internet looking for one, there always seem to be 2 available, with the difference being one for a different chassis. Where can I locate my chassis number to correctly purchase the right part? Thanks!

what year do you have? what engine?

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2004 VW Touareg
2005.5 Audi A4
1997 Audi A4

98 a4 quattro 2.8 automatic

well first you should look at yours to verify what i'm telling you is correct. The part number is stamped on the outside of it.

078 133 471 C - housing

037 906 461C - sensor

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2004 VW Touareg
2005.5 Audi A4
1997 Audi A4